diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 674c597..e77db88 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2712,6 +2712,7 @@
 					- ((648c2c9a-fcca-43e3-94a6-466f52131b48))
 						- ((648c2d05-82d4-472f-901c-b362852e2a3a))
 						- 换元的示例
+						  collapsed:: true
 							- ((648c2de1-d9a7-4760-bb4f-beec4b41102c))
 							- ((648c488f-85fa-4203-8092-07176b38fce9))
 						- 公式法 #flashcard