diff --git a/src/Ch09_Error_Handling.md b/src/Ch09_Error_Handling.md
index e70e1dd..96adc2f 100644
--- a/src/Ch09_Error_Handling.md
+++ b/src/Ch09_Error_Handling.md
@@ -36,7 +36,7 @@ fn main() {
 
 
 ```console
-$ cargo run                                                         
+$ cargo run
    Compiling error_handling_demo v0.1.0 (/home/lenny/rust-lang/error_handling_demo)
     Finished dev [unoptimized + debuginfo] target(s) in 0.40s
      Running `target/debug/error_handling_demo`
@@ -229,7 +229,7 @@ fn main() {
         Err(e) => match e.kind() {
             ErrorKind::NotFound => match File::create("hello.txt") {
                 Ok(fc) => fc,
-                Err(error) => panic! ("创建该文件时出现问题：{:?}", error), 
+                Err(error) => panic! ("创建该文件时出现问题：{:?}", error),
             },
             other_error => panic! ("打开文件出现问题：{:?}", other_error),
         },
diff --git a/src/Ch21_Appendix.md b/src/Ch21_Appendix.md
index 225f626..0526081 100644
--- a/src/Ch21_Appendix.md
+++ b/src/Ch21_Appendix.md
@@ -173,10 +173,10 @@ fn main() {
 | `@` | `ident @ pat` | 模式绑定 |  |
 | `^` | `var ^ expr` | 按位异或运算 | `BitXor` |
 | `^=` | `var ^= expr` | 按位异或运算并赋值 | `BitXorAssign` |
-| `\|` | `pat | pat` | 模式选择，pattern alternatives |  |
-| `\|` | `expr | expr` | 按位或运算 | `BitOr` |
-| `\|=` | `var |= expr` | 按位或运算并赋值 | `BitOrAssign` |
-| `\|\|` | `expr || expr` | 短路逻辑或运算 |  |
+| <code>|</code> | <code>pat | pat</code> | 模式选择，pattern alternatives |  |
+| <code>|</code> | <code>expr | expr</code> | 按位或运算 | `BitOr` |
+| <code>|=</code> | <code>var |= expr</code> | 按位或运算并赋值 | `BitOrAssign` |
+| <code>||</code> | <code>expr || expr</code> | 短路逻辑或运算 |  |
 | `?` | `expr?` | 错误传递 |  |
 
 ### 非运算符的符号