diff --git a/zh/07.6.md b/zh/07.6.md
index b2f6fbceec3d5f895a0101bdb2a074f16a29e5cb..e33a97f84b4dce76c6f668484ad306bfce5d362c 100644
--- a/zh/07.6.md
+++ b/zh/07.6.md
@@ -6,7 +6,9 @@
 - func Contains(s, substr string) bool
 
 	字符串s中是否包含substr，返回bool值
-	
+
+```Go
+
 		fmt.Println(strings.Contains("seafood", "foo"))
 		fmt.Println(strings.Contains("seafood", "bar"))
 		fmt.Println(strings.Contains("seafood", ""))
@@ -17,43 +19,56 @@
 		//true
 		//true
 
+```
+
 - func Join(a []string, sep string) string
 
 	字符串链接，把slice a通过sep链接起来
-	
+
+```Go
+
 		s := []string{"foo", "bar", "baz"}
 		fmt.Println(strings.Join(s, ", "))
 		//Output:foo, bar, baz		
-			
+```
+
 - func Index(s, sep string) int 
 
 	在字符串s中查找sep所在的位置，返回位置值，找不到返回-1
-	
+
+```Go
+
 		fmt.Println(strings.Index("chicken", "ken"))
 		fmt.Println(strings.Index("chicken", "dmr"))
 		//Output:4
 		//-1
-
+```
 - func Repeat(s string, count int) string
 
 	重复s字符串count次，最后返回重复的字符串
-	
+
+```Go
+
 		fmt.Println("ba" + strings.Repeat("na", 2))
 		//Output:banana
-
+```
 - func Replace(s, old, new string, n int) string
 
 	在s字符串中，把old字符串替换为new字符串，n表示替换的次数，小于0表示全部替换
-	
+
+```Go
+
 		fmt.Println(strings.Replace("oink oink oink", "k", "ky", 2))
 		fmt.Println(strings.Replace("oink oink oink", "oink", "moo", -1))
 		//Output:oinky oinky oink
 		//moo moo moo
-
+```
 - func Split(s, sep string) []string
 
 	把s字符串按照sep分割，返回slice
-	
+
+```Go
+
 		fmt.Printf("%q\n", strings.Split("a,b,c", ","))
 		fmt.Printf("%q\n", strings.Split("a man a plan a canal panama", "a "))
 		fmt.Printf("%q\n", strings.Split(" xyz ", ""))
@@ -62,27 +77,35 @@
 		//["" "man " "plan " "canal panama"]
 		//[" " "x" "y" "z" " "]
 		//[""]
+```
 
 - func Trim(s string, cutset string) string
 
 	在s字符串的头部和尾部去除cutset指定的字符串
 	
+```Go
+
 		fmt.Printf("[%q]", strings.Trim(" !!! Achtung !!! ", "! "))
 		//Output:["Achtung"]
+```
 
 - func Fields(s string) []string
 
 	去除s字符串的空格符，并且按照空格分割返回slice
 	
+```Go
+
 		fmt.Printf("Fields are: %q", strings.Fields("  foo bar  baz   "))
 		//Output:Fields are: ["foo" "bar" "baz"]
-
+```
 
 ## 字符串转换
 字符串转化的函数在strconv中，如下也只是列出一些常用的：
 
 - Append 系列函数将整数等转换为字符串后，添加到现有的字节数组中。
 
+```Go
+
 		package main
 		
 		import (
@@ -98,8 +121,10 @@
 			str = strconv.AppendQuoteRune(str, '单')
 			fmt.Println(string(str))
 		}
+```
 
 - Format 系列函数把其他类型的转换为字符串
+```Go
 
 		package main
 	
@@ -117,8 +142,12 @@
 			fmt.Println(a, b, c, d, e)
 		}
 
+```
+
 - Parse 系列函数把字符串转换为其他类型
-		
+
+```Go
+
 		package main
 
 		import (
@@ -144,7 +173,7 @@
 			fmt.Println(a, b, c, d, e)
 		}
 
-	
+```
 
 ## links
    * [目录](<preface.md>)