diff --git a/book/contents/basic/base-type/numbers.md b/book/contents/basic/base-type/numbers.md
index f2877da9..07559796 100644
--- a/book/contents/basic/base-type/numbers.md
+++ b/book/contents/basic/base-type/numbers.md
@@ -126,8 +126,8 @@ fn main() {
     42.0_f32,
   ];
 
-// 打印数组中第一个值，其中控制小数位为2位
-println!("{:02}", forty_twos[0]);
+  // 打印数组中第一个值，并控制小数位为2位
+  println!("{:.2}", forty_twos[0]);
 }
  ```