diff --git a/assets/section_2.4_1686920705980_0.edn b/assets/section_2.4_1686920705980_0.edn
new file mode 100644
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--- /dev/null
+++ b/assets/section_2.4_1686920705980_0.edn
@@ -0,0 +1,18 @@
+{:highlights [{:id #uuid "648c5e0c-b0b1-4129-b172-3ff95ff4a41c",
+               :page 4,
+               :position {:bounding {:x1 14.173179626464844,
+                                     :y1 13.255218505859375,
+                                     :x2 234.22313690185547,
+                                     :y2 39.921875,
+                                     :width 604.7249999999999,
+                                     :height 453.54333333333324},
+                          :rects ({:x1 14.173179626464844,
+                                   :y1 13.255218505859375,
+                                   :x2 234.22313690185547,
+                                   :y2 39.921875,
+                                   :width 604.7249999999999,
+                                   :height 453.54333333333324}),
+                          :page 4},
+               :content {:text "Binomial Distribution"},
+               :properties {:color "blue"}}],
+ :extra {:page 3}}
diff --git a/assets/section_2.4_1686920705980_0.pdf b/assets/section_2.4_1686920705980_0.pdf
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diff --git a/pages/hls__section_2.4_1686920705980_0.md b/pages/hls__section_2.4_1686920705980_0.md
new file mode 100644
index 0000000..7e10849
--- /dev/null
+++ b/pages/hls__section_2.4_1686920705980_0.md
@@ -0,0 +1,8 @@
+file:: [section_2.4_1686920705980_0.pdf](../assets/section_2.4_1686920705980_0.pdf)
+file-path:: ../assets/section_2.4_1686920705980_0.pdf
+
+- Binomial Distribution
+  ls-type:: annotation
+  hl-page:: 4
+  hl-color:: blue
+  id:: 648c5e0c-b0b1-4129-b172-3ff95ff4a41c
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index a87e743..5ebca05 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2692,9 +2692,11 @@
 				  CLOCK: [2023-06-16 Fri 17:15:12]
 				  :END:
 					- The Definition of a Random Variable ![section 2.1.pdf](../assets/section_2.1_1686906920851_0.pdf)
+					  collapsed:: true
 						- ((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))
@@ -2710,6 +2712,7 @@
 						  collapsed:: true
 							- ((648c2c54-b536-40ba-8191-ef1aeb2be0b9))
 					- ((648c2c9a-fcca-43e3-94a6-466f52131b48))
+					  collapsed:: true
 						- ((648c2d05-82d4-472f-901c-b362852e2a3a))
 						- 换元的示例
 						  collapsed:: true
@@ -2719,7 +2722,9 @@
 						  collapsed:: true
 							- ((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))
 							- Examples:
 							  collapsed:: true
@@ -2730,11 +2735,14 @@
 							  collapsed:: true
 								- ((648c5381-49cd-4701-ba48-31c0e21474a7))
 							- Properties:
+							  collapsed:: true
 								- ((648c568e-c617-4699-b217-fd4e8ea205bc))
 								- Linerarity:
 								  ((648c569c-e3d0-445d-acf6-caf0e271f7be))
 						- Variance
+						  collapsed:: true
 							- Definition:
+							  collapsed:: true
 								- ((648c57b6-225a-4926-9ce1-8d0e7aae1391))
 								- Alternative calculation:
 								  collapsed:: true
@@ -2751,15 +2759,24 @@
 									  collapsed:: true
 										- ((648c5b30-e75f-4f0c-bb7d-985442728fbe))
 						- LATER Moments of random variable
+						  collapsed:: true
 							- Definition :-> ((648c5c3a-160a-41ff-9cc7-83e750e3e8fa))
 						- Application of Expectation and Variation
+						  collapsed:: true
 							- *Markov's inequality*: when **only mean** is known #flashcard
+							  collapsed:: true
 								- ((648c5c6f-d6b4-4c65-b9a4-9f51f93f86ad))
 							- *Chebyshev's inequality*: when **mean an variance are** known #flashcard
+							  collapsed:: true
 								- ((648c5c81-d93b-4859-9ee0-37cceb8fd100))
 							- **Usage** of Markov's inequality and Chebyshev's inequality
+							  collapsed:: true
 								- ((648c5cf5-239a-4d47-a57a-d65c53c215c4))
-							- **Example**:
+							- **Example**: ((648c5de0-d650-443a-8a67-768066dce154))
+							  collapsed:: true
+								-
+					- ((648c5e0c-b0b1-4129-b172-3ff95ff4a41c)) and  ![section 2.4.pdf](../assets/section_2.4_1686920705980_0.pdf)
+						-
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01