diff --git a/src/basic/trait/advance-trait.md b/src/basic/trait/advance-trait.md
index 3518f850..96ae8110 100644
--- a/src/basic/trait/advance-trait.md
+++ b/src/basic/trait/advance-trait.md
@@ -88,6 +88,7 @@ trait Container{
     type B;
     fn contains(&self, a: &Self::A, b: &Self::B) -> bool;
 }
+```
 
 ## 默认泛型类型参数