diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index c282c2c..a8a7e8c 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2696,7 +2696,6 @@
 						- ((648c2860-5454-45f1-80f8-1c85bce84fd1))
 						- ((648c290a-3532-4e56-8536-258daf7b00a7))
 					- Distribution Function
-					  collapsed:: true
 						- ((648c2970-9091-4f46-8745-b0c10cdeb832))
 						  collapsed:: true
 							- ((648c2994-36eb-44bf-8038-e49d2390a5b0))
@@ -2720,9 +2719,7 @@
 						  id:: 648c4893-5e69-41dc-95a4-090a06cd1735
 							- ((648c48ac-76be-4848-af0d-1532467c8d68))
 					- Mathematical Expectation and Variance ![section 2.3.pdf](../assets/section_2.3_1686916498071_0.pdf)
-					  collapsed:: true
 						- Expectation
-						  collapsed:: true
 							- Definitions :-> ((648c4e9e-5515-4da3-bc6b-39d6969f5f14))
 							  id:: 648c4e9f-7b40-4df5-ab81-e6eb49536831
 							- Examples:
@@ -2741,9 +2738,7 @@
 								- Linerarity:
 								  ((648c569c-e3d0-445d-acf6-caf0e271f7be))
 						- Variance
-						  collapsed:: true
 							- Definition:
-							  collapsed:: true
 								- ((648c57b6-225a-4926-9ce1-8d0e7aae1391))
 								- Alternative calculation:
 								  collapsed:: true
@@ -2765,7 +2760,6 @@
 							- Definition :-> ((648c5c3a-160a-41ff-9cc7-83e750e3e8fa))
 							  id:: 648c5c30-6a99-41f4-be4c-e5e22387647a
 						- Application of Expectation and Variation
-						  collapsed:: true
 							- *Markov's inequality*: when **only mean** is known #flashcard
 							  id:: 648c5c5c-623c-43de-b750-b997db48e6dd
 							  collapsed:: true