diff --git a/README.md b/README.md
index c8471a9..057c31e 100644
--- a/README.md
+++ b/README.md
@@ -42,11 +42,19 @@
         固定附加库中的字到主库
 ```
 下面是一些用例。
-### 查询一个字的国际音标、部首、全局ID
+### 计算一个字的国际音标、部首、全局ID
+> 该计算不查数据库, 完全与数据库无关.
 ```bash
 go run cmd/main.go -i -a 哦 -p o
 文字: 哦 拼音IPA: 0 ɔ 轻声 ID: 93346820784388
 ```
+### 查询库中记录的字的信息
+```bash
+go run cmd/main.go -a 行
+查询到汉字 行 的记录:
+0)      #149859999752449 行 [ɕiŋ阳平] 从行 xing xínɡ
+1)      #149859999554817 行 [xɑŋ阳平] 从行 hang háng
+```
 ### 编码
 > 注意: 可以指定`-nr`参数从而使编解码结果唯一。
 ```bash
diff --git a/cmd/main.go b/cmd/main.go
index bd90e65..8321e1a 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -132,4 +132,20 @@ func main() {
 		}
 		fmt.Println("已删除汉字ID:", *deloverlay)
 	}
+	if *addoverlay != "" {
+		r := []rune(*addoverlay)
+		if len(r) != 1 {
+			fmt.Println("ERROR: 非法汉字参数-a:", *addoverlay)
+			return
+		}
+		lst, err := coder.Lookup(r[0])
+		if err != nil {
+			fmt.Println("ERROR: coder.Lookup:", err)
+			return
+		}
+		fmt.Println("查询到汉字", *addoverlay, "的记录:")
+		for i, x := range lst {
+			fmt.Printf("%d)\t%s\n", i, x)
+		}
+	}
 }
diff --git a/coder.go b/coder.go
index 328234f..b2c245c 100644
--- a/coder.go
+++ b/coder.go
@@ -1,9 +1,7 @@
 package emozi
 
 import (
-	"errors"
 	"os"
-	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -214,139 +212,3 @@ func (c *Coder) Decode(es EmoziString, forcedecode bool) (string, error) {
 	}
 	return sb.String(), nil
 }
-
-// AddChar 向主库添加一个新字
-//
-// w: 字, r: 部首, p: 不带声调的拼音(可空), f: 带声调的拼音
-func (c *Coder) AddChar(w, r, p, f string) error {
-	if p == "" {
-		p = 去调(f)
-	}
-	s, y, t, rw, rr, err := 拆音识字(w, r, p, f)
-	if err != nil {
-		return err
-	}
-	c.mu.Lock()
-	err = c.db.InsertUnique(主字表名, &字表{
-		ID: 字表ID(rw, s, y, t),
-		W:  rw, S: s, Y: y, T: t,
-		R: rr, P: p, F: f,
-	})
-	c.mu.Unlock()
-	if err != nil {
-		return errors.New("已有同音同形的字 '" + w + "'")
-	}
-	return nil
-}
-
-// AddCharOverlay 向附加库添加一个新字, 覆盖在主库之上
-//
-// w: 字, r: 部首, p: 不带声调的拼音(可空), f: 带声调的拼音
-// 返回: 字表ID, 文字描述, error
-func (c *Coder) AddCharOverlay(w, r, p, f string) (int64, string, error) {
-	if p == "" {
-		p = 去调(f)
-	}
-	s, y, t, rw, rr, err := 拆音识字(w, r, p, f)
-	if err != nil {
-		return 0, "", err
-	}
-	return c.addcharoverlay(w, p, f, s, y, t, rw, rr)
-}
-
-func (c *Coder) addcharoverlay(w, p, f string, s 声母枚举, y 韵母枚举, t 声调枚举, rw rune, rr rune) (int64, string, error) {
-	id := 字表ID(rw, s, y, t)
-	c.mu.Lock()
-	err := c.db.InsertUnique(附字表名, &字表{
-		ID: id,
-		W:  rw, S: s, Y: y, T: t,
-		R: rr, P: p, F: f,
-	})
-	c.mu.Unlock()
-	if err != nil {
-		return 0, "", errors.New("已有同音同形的字 '" + w + "'")
-	}
-	sb := strings.Builder{}
-	sb.WriteString(s.String())
-	sb.WriteString(", ")
-	sb.WriteString(y.String())
-	sb.WriteString(", ")
-	sb.WriteString(t.String())
-	return id, sb.String(), nil
-}
-
-// ChangeCharOverlay 更改附加库的一项
-func (c *Coder) ChangeCharOverlay(oldw, oldr, oldf, neww, newr, newf string) (int64, string, error) {
-	s, y, t, rw, rr, err := 拆音识字(oldw, oldr, 去调(oldf), oldf)
-	if err != nil {
-		return 0, "", err
-	}
-	newp := 去调(newf)
-	ns, ny, nt, nrw, nrr, err := 拆音识字(neww, newr, newp, newf)
-	if err != nil {
-		return 0, "", err
-	}
-	q := "WHERE ID=" + strconv.FormatInt(字表ID(rw, s, y, t), 10)
-	x := 字表{}
-	c.mu.RLock()
-	err = c.db.Find(附字表名, &x, q)
-	c.mu.RUnlock()
-	if err != nil {
-		return 0, "", err
-	}
-	if x.R != rr {
-		return 0, "", errors.New("提供的旧部首 '" + string(rr) + "' 与记载的 '" + string(x.R) + "' 不符")
-	}
-	c.mu.Lock()
-	err = c.db.Del(附字表名, q)
-	c.mu.Unlock()
-	if err != nil {
-		return 0, "", err
-	}
-	return c.addcharoverlay(neww, newp, newf, ns, ny, nt, nrw, nrr)
-}
-
-// StabilizeCharFromOverlay 将附加库中的一项固定到主库
-func (c *Coder) StabilizeCharFromOverlay(id int64) (string, error) {
-	x := 字表{}
-	q := "WHERE ID=" + strconv.FormatInt(id, 10)
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	err := c.db.Find(附字表名, &x, q)
-	if err != nil {
-		return "", err
-	}
-	err = c.db.Insert(主字表名, &x)
-	if err != nil {
-		return x.String(), err
-	}
-	return x.String(), c.db.Del(附字表名, q)
-}
-
-// DelChar 删除主库的一个字
-func (c *Coder) DelChar(id int64) error {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.db.Del(主字表名, "WHERE ID="+strconv.FormatInt(id, 10))
-}
-
-// DelCharOverlay 删除附加库的一个字
-func (c *Coder) DelCharOverlay(id int64) error {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.db.Del(附字表名, "WHERE ID="+strconv.FormatInt(id, 10))
-}
-
-// AddRadical 添加一个部首
-func (c *Coder) AddRadical(r rune, e string) error {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.db.InsertUnique(部首表名, &部首表{R: r, E: e})
-}
-
-// DelRadical 删除一个部首
-func (c *Coder) DelRadical(r rune) error {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	return c.db.Del(部首表名, "WHERE R="+strconv.Itoa(int(r)))
-}
diff --git a/data.go b/data.go
index 2820de8..8a4e3f8 100644
--- a/data.go
+++ b/data.go
@@ -25,6 +25,12 @@ var (
 	ErrNoSuchChar = errors.New("no such char")
 )
 
+// 从表 从部首表
+type 部首表 struct {
+	R rune   // R 该部首
+	E string `db:"E,UNIQUE"` // E 该部首对应的颜文字
+}
+
 // 字表 emozi表 定义
 type 字表 struct {
 	ID int64 // ID 高 32 位 W 的 rune, 低 32 位 保留8 S8 Y8 T8
@@ -98,11 +104,11 @@ func (c *Coder) 查字(ch rune, lstbuf []字表) ([]字表, []字表, error) {
 	})
 	if err != nil {
 		lstbuf = lstbuf[:0]
-		err = c.db.FindFor(主字表名, &x, q, func() error {
-			lstbuf = append(lstbuf, x)
-			return nil
-		})
 	}
+	err = c.db.FindFor(主字表名, &x, q, func() error {
+		lstbuf = append(lstbuf, x)
+		return nil
+	})
 	if err != nil {
 		c.字表缓存[ch] = nil
 		return nil, lstbuf, err
@@ -172,8 +178,138 @@ func (c *Coder) 逆字(s 声母枚举, y 韵母枚举, t 声调枚举, r rune, l
 	return rs, lstbuf, nil
 }
 
-// 从表 从部首表
-type 部首表 struct {
-	R rune   // R 该部首
-	E string `db:"E,UNIQUE"` // E 该部首对应的颜文字
+// AddChar 向主库添加一个新字
+//
+// w: 字, r: 部首, p: 不带声调的拼音(可空), f: 带声调的拼音
+func (c *Coder) AddChar(w, r, p, f string) error {
+	if p == "" {
+		p = 去调(f)
+	}
+	s, y, t, rw, rr, err := 拆音识字(w, r, p, f)
+	if err != nil {
+		return err
+	}
+	c.mu.Lock()
+	err = c.db.InsertUnique(主字表名, &字表{
+		ID: 字表ID(rw, s, y, t),
+		W:  rw, S: s, Y: y, T: t,
+		R: rr, P: p, F: f,
+	})
+	c.mu.Unlock()
+	if err != nil {
+		return errors.New("已有同音同形的字 '" + w + "'")
+	}
+	return nil
+}
+
+// AddCharOverlay 向附加库添加一个新字, 覆盖在主库之上
+//
+// w: 字, r: 部首, p: 不带声调的拼音(可空), f: 带声调的拼音
+// 返回: 字表ID, 文字描述, error
+func (c *Coder) AddCharOverlay(w, r, p, f string) (int64, string, error) {
+	if p == "" {
+		p = 去调(f)
+	}
+	s, y, t, rw, rr, err := 拆音识字(w, r, p, f)
+	if err != nil {
+		return 0, "", err
+	}
+	return c.addcharoverlay(w, p, f, s, y, t, rw, rr)
+}
+
+func (c *Coder) addcharoverlay(w, p, f string, s 声母枚举, y 韵母枚举, t 声调枚举, rw rune, rr rune) (int64, string, error) {
+	id := 字表ID(rw, s, y, t)
+	c.mu.Lock()
+	err := c.db.InsertUnique(附字表名, &字表{
+		ID: id,
+		W:  rw, S: s, Y: y, T: t,
+		R: rr, P: p, F: f,
+	})
+	c.mu.Unlock()
+	if err != nil {
+		return 0, "", errors.New("已有同音同形的字 '" + w + "'")
+	}
+	sb := strings.Builder{}
+	sb.WriteString(s.String())
+	sb.WriteString(", ")
+	sb.WriteString(y.String())
+	sb.WriteString(", ")
+	sb.WriteString(t.String())
+	return id, sb.String(), nil
+}
+
+// ChangeCharOverlay 更改附加库的一项
+func (c *Coder) ChangeCharOverlay(oldw, oldr, oldf, neww, newr, newf string) (int64, string, error) {
+	s, y, t, rw, rr, err := 拆音识字(oldw, oldr, 去调(oldf), oldf)
+	if err != nil {
+		return 0, "", err
+	}
+	newp := 去调(newf)
+	ns, ny, nt, nrw, nrr, err := 拆音识字(neww, newr, newp, newf)
+	if err != nil {
+		return 0, "", err
+	}
+	q := "WHERE ID=" + strconv.FormatInt(字表ID(rw, s, y, t), 10)
+	x := 字表{}
+	c.mu.RLock()
+	err = c.db.Find(附字表名, &x, q)
+	c.mu.RUnlock()
+	if err != nil {
+		return 0, "", err
+	}
+	if x.R != rr {
+		return 0, "", errors.New("提供的旧部首 '" + string(rr) + "' 与记载的 '" + string(x.R) + "' 不符")
+	}
+	c.mu.Lock()
+	err = c.db.Del(附字表名, q)
+	c.mu.Unlock()
+	if err != nil {
+		return 0, "", err
+	}
+	return c.addcharoverlay(neww, newp, newf, ns, ny, nt, nrw, nrr)
+}
+
+// StabilizeCharFromOverlay 将附加库中的一项固定到主库
+func (c *Coder) StabilizeCharFromOverlay(id int64) (string, error) {
+	x := 字表{}
+	q := "WHERE ID=" + strconv.FormatInt(id, 10)
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	err := c.db.Find(附字表名, &x, q)
+	if err != nil {
+		return "", err
+	}
+	err = c.db.Insert(主字表名, &x)
+	if err != nil {
+		return x.String(), err
+	}
+	return x.String(), c.db.Del(附字表名, q)
+}
+
+// DelChar 删除主库的一个字
+func (c *Coder) DelChar(id int64) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.db.Del(主字表名, "WHERE ID="+strconv.FormatInt(id, 10))
+}
+
+// DelCharOverlay 删除附加库的一个字
+func (c *Coder) DelCharOverlay(id int64) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.db.Del(附字表名, "WHERE ID="+strconv.FormatInt(id, 10))
+}
+
+// AddRadical 添加一个部首
+func (c *Coder) AddRadical(r rune, e string) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.db.InsertUnique(部首表名, &部首表{R: r, E: e})
+}
+
+// DelRadical 删除一个部首
+func (c *Coder) DelRadical(r rune) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.db.Del(部首表名, "WHERE R="+strconv.Itoa(int(r)))
 }
diff --git a/define.go b/define.go
index 7b03f29..faba199 100644
--- a/define.go
+++ b/define.go
@@ -76,8 +76,8 @@ var 声母 = [...][]string{
 	{"🐽", "🐷", "🪡", "💉"},
 	// ch: 茶茶车车车车床床除虫
 	{"🍵", "☕️", "🚗", "🚘", "🚙", "🛻", "🛏️", "🛌", "➗", "🐛"},
-	// sh: 水水书书书书书书上上上石山山山树树树蛇鼠鼠鼠珊
-	{"💦", "💧", "📖", "📕", "📗", "📘", "📙", "📚", "⬆️", "☝️", "👆", "🪨", "⛰️", "🏔️", "🗻", "🌲", "🌳", "🌴", "🐍", "🐭", "🐀", "🐁", "🪸"},
+	// sh: 水水书书书书书书上上上石山山山树树树蛇鼠鼠鼠珊18
+	{"💦", "💧", "📖", "📕", "📗", "📘", "📙", "📚", "⬆️", "☝️", "👆", "🪨", "⛰️", "🏔️", "🗻", "🌲", "🌳", "🌴", "🐍", "🐭", "🐀", "🐁", "🪸", "🔞"},
 	// r: 肉日日日
 	{"🥩", "🌞", "☀️", "🌅"},
 	// z: 左左左			c: 错错错错				s: 锁伞伞伞伞蒜
@@ -167,12 +167,12 @@ const (
 // 韵母 仅由一种意象表示
 var 韵母 = [...][]string{
 	{"😧", "🤔️"}, {"😲"}, {"😋"}, {"👔", "👗", "👕", "👚"}, {"🌞", "☀️", "🌅"},
-	{string([]rune("🌫️")[0]), "🌫️"}, {"🐟", "🌧️"}, {"👂"},
-	{string([]rune("❤️")[0]), "❤️", "💗", "💓", "🫶", "💕", "💖", "💘", "💙", "💚", "💛", "💜", "💝", "💞", "🧡"}, {"🥢"}, {"😩"}, {"🐢"},
+	{"🈚", "🌫️"}, {"🐟", "🌧️"}, {"👂"},
+	{"💟", "❤️", "💗", "💓", "🫶", "💕", "💖", "💘", "💙", "💚", "💛", "💜", "💝", "💞", "🧡"}, {"🥢"}, {"😩"}, {"🐢"},
 	{"🐱", "🐈", "🐈‍⬛", "😺"}, {"💊"}, {"🤮", "🤢"}, {"👉", "➡️"},
-	{"🦷"}, {"🧦"}, {"🌀"}, {string([]rune("✌️")[0]), "✌️"}, {"🌙", "🌕", "🌛", "🌝"}, {"🔐"}, {"🚬"}, {"🥣", "🍚"},
-	{string([]rune("⭕️")[0]), "⭕️"}, {"😐"}, {"😘", "💋"}, {"🎵"}, {string([]rune("☁️")[0]), "☁️"}, {"👍"}, {"🐑"},
-	{string([]rune("🕸️")[0]), "🕸️"}, {"💡", "🪔"}, {"🦅"}, {"🐝"}, {"🌈"}, {"😳"}, // jiong 囧
+	{"🦷"}, {"🧦"}, {"🌀"}, {"👴", "✌️"}, {"🌙", "🌕", "🌛", "🌝"}, {"🔐"}, {"🚬"}, {"🥣", "🍚"},
+	{"🔘", "⭕️"}, {"😐"}, {"😘", "💋"}, {"🎵"}, {"☁"}, {"👍"}, {"🐑"},
+	{"🥅", "🕸️"}, {"💡", "🪔"}, {"🦅"}, {"🐝"}, {"🌈"}, {"😳"}, // jiong 囧
 }
 
 // 低阶逆韵母 rune韵母到韵母的逆映射
diff --git a/define_test.go b/define_test.go
index 920ffc3..29c3959 100644
--- a/define_test.go
+++ b/define_test.go
@@ -8,7 +8,6 @@ func TestFirstEmojiSingle(t *testing.T) {
 			t.Fatal("声母", i, "长度", len([]rune(lst[0])), "字", lst[0])
 		}
 	}
-	t.Log(string([]rune("🌫️")[0]), string([]rune("❤️")[0]), string([]rune("✌️")[0]), string([]rune("⭕️")[0]), string([]rune("☁️")[0]), string([]rune("🕸️")[0]))
 	for i, lst := range 韵母 {
 		if len([]rune(lst[0])) != 1 {
 			t.Fatal("韵母", i, "长度", len([]rune(lst[0])), "字", lst[0])
diff --git a/lookup.go b/lookup.go
index b9f3542..e73eef4 100644
--- a/lookup.go
+++ b/lookup.go
@@ -8,6 +8,19 @@ import (
 
 const 空 = '🈳'
 
+// Lookup 查一个汉字 (可能是多音字)
+func (c *Coder) Lookup(ch rune) (explains []string, err error) {
+	lst, _, err := c.查字(ch, make([]字表, 0, 8))
+	if err != nil || len(lst) == 0 {
+		return
+	}
+	explains = make([]string, len(lst))
+	for i, x := range lst {
+		explains[i] = x.String()
+	}
+	return
+}
+
 func 随机正查(m [][]string, isRandom bool, i uint8) string {
 	lst := m[i]
 	if len(lst) == 0 {
diff --git a/radical.go b/radical.go
index 210a57a..ea77a82 100644
--- a/radical.go
+++ b/radical.go
@@ -329,8 +329,8 @@ var 部首后备 = map[rune]string{
 	'㱃': string(空),
 	'㳄': string(空),
 	'旡': string(空),
-	'頁': string(空),
-	'𦣻': string(空),
+	'頁': "👱‍♂️",
+	'𦣻': "👱",
 	'面': string(空),
 	'丏': string(空),
 	'首': string(空),
@@ -338,7 +338,7 @@ var 部首后备 = map[rune]string{
 	'須': string(空),
 	'彡': string(空),
 	'彣': string(空),
-	'文': string(空),
+	'文': "💮",
 	'髟': string(空),
 	'后': string(空),
 	'司': string(空),
@@ -374,25 +374,25 @@ var 部首后备 = map[rune]string{
 	'豸': string(空),
 	'𤉡': string(空),
 	'易': string(空),
-	'象': string(空),
-	'馬': string(空),
+	'象': "🐘",
+	'馬': "🐎",
 	'𢊁': string(空),
-	'鹿': string(空),
+	'鹿': "🦌",
 	'麤': string(空),
 	'㲋': string(空),
-	'兔': string(空),
+	'兔': "🐰",
 	'萈': string(空),
-	'犬': string(空),
+	'犬': "🐶",
 	'㹜': string(空),
-	'鼠': string(空),
+	'鼠': "🐭",
 	'能': string(空),
-	'熊': string(空),
-	'火': string(空),
-	'炎': string(空),
+	'熊': "🐻",
+	'火': "🔥",
+	'炎': "🔥",
 	'黑': string(空),
 	'囪': string(空),
 	'焱': string(空),
-	'炙': string(空),
+	'炙': "🍖",
 	'赤': string(空),
 	'大': string(空),
 	'亦': string(空),
@@ -415,12 +415,12 @@ var 部首后备 = map[rune]string{
 	'思': string(空),
 	'心': string(空),
 	'惢': string(空),
-	'水': string(空),
-	'沝': string(空),
+	'水': "💧",
+	'沝': "💦",
 	'瀕': string(空),
-	'𡿨': string(空),
-	'巜': string(空),
-	'川': string(空),
+	'𡿨': "🫗",
+	'巜': "⛜",
+	'川': "💦",
 	'泉': string(空),
 	'灥': string(空),
 	'永': string(空),
@@ -501,7 +501,7 @@ var 部首后备 = map[rune]string{
 	'斤': string(空),
 	'斗': string(空),
 	'矛': string(空),
-	'車': string(空),
+	'車': "🚲",
 	'𠂤': string(空),
 	'𨸏': string(空),
 	'𨺅': string(空),