diff --git a/assets/section_2.5_1686968005870_0.edn b/assets/section_2.5_1686968005870_0.edn
new file mode 100644
index 0000000..d89c87b
--- /dev/null
+++ b/assets/section_2.5_1686968005870_0.edn
@@ -0,0 +1 @@
+{:highlights [], :extra {:page 2}}
diff --git a/assets/section_2.5_1686968005870_0.pdf b/assets/section_2.5_1686968005870_0.pdf
new file mode 100644
index 0000000..785305f
Binary files /dev/null and b/assets/section_2.5_1686968005870_0.pdf differ
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 40ec906..bd837dc 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2788,10 +2788,12 @@
 						  collapsed:: true
 							- Definition: #flashcard
 							  id:: 648c5ef0-fd5e-4f17-9e2d-fde0c67e53c6
+							  collapsed:: true
 								- ((648c5fc2-c838-473b-9b29-f238ae3a96ca))
 								- ((648c5f9a-646f-4eea-9d03-597d8598f752))
 								- ((648c5fa8-25a4-47ba-a285-e9399f719543))
 							- Properties:
+							  collapsed:: true
 								- mean, variance :-> ((648c6007-c181-4e85-9a88-046841e6739d))
 								  id:: 648c6001-da22-465c-95f1-51a7e5292cb3
 							- Examples:
@@ -2800,16 +2802,22 @@
 								- ((648c63b8-21ff-42d4-ad87-70c706124ba1))
 							- LATER Poisson limit theorem #flashcard (when n is infinity, this become Poisson distribution)
 							  id:: 648c63bc-2465-42e5-833f-abd152201631
+							  collapsed:: true
 								- ((648c63da-deea-42ab-8f72-f3219d4fecbc))
 						- Poisson distribution
+						  collapsed:: true
 							- Definition: :-> ((648c653d-ed40-4938-9124-cf4c2c296867))
 							  id:: 648c6510-49a0-4673-bf16-4cf9f47efa14
 							- Use cases:
+							  collapsed:: true
 								- ((648c65ba-0f8f-4371-a52e-e78e8b3ae512))
 							- Properties:
+							  collapsed:: true
 								- Variance, mean :-> ((648c65dd-356b-4209-85ae-e881033fcea8))
 								  id:: 648c65d1-7592-43f7-a12c-d96d9e76a492
 								- DONE Examples
+					- Distribution of continuous random variables![section 2.5.pdf](../assets/section_2.5_1686968005870_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