diff --git a/_teaching/2015-spring-teaching-2.md b/_teaching/2015-spring-teaching-2.md
index 2896676aa923b..6eeafed6e3ce0 100644
--- a/_teaching/2015-spring-teaching-2.md
+++ b/_teaching/2015-spring-teaching-2.md
@@ -10,7 +10,7 @@ location: ""
 
 
 
-通过博弈论课程引入MARL   ---->    
+通过博弈论课程引入MARL