diff --git a/assets/section_3.4_1686989774901_0.edn b/assets/section_3.4_1686989774901_0.edn
index 7468025..b131a8b 100644
--- a/assets/section_3.4_1686989774901_0.edn
+++ b/assets/section_3.4_1686989774901_0.edn
@@ -134,5 +134,17 @@
                           :rects (),
                           :page 26},
                :content {:text "[:span]", :image 1686992678128},
+               :properties {:color "yellow"}}
+              {:id #uuid "648d77b1-1d4a-4c69-b309-e398fccab797",
+               :page 27,
+               :position {:bounding {:x1 189,
+                                     :y1 350.8330078125,
+                                     :x2 545,
+                                     :y2 403.8330078125,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects (),
+                          :page 27},
+               :content {:text "[:span]", :image 1686992817580},
                :properties {:color "yellow"}}],
  :extra {:page 27}}
diff --git a/assets/section_3.4_1686989774901_0/27_648d77b1-1d4a-4c69-b309-e398fccab797_1686992817580.png b/assets/section_3.4_1686989774901_0/27_648d77b1-1d4a-4c69-b309-e398fccab797_1686992817580.png
new file mode 100644
index 0000000..56f540c
Binary files /dev/null and b/assets/section_3.4_1686989774901_0/27_648d77b1-1d4a-4c69-b309-e398fccab797_1686992817580.png differ
diff --git a/pages/hls__section_3.4_1686989774901_0.md b/pages/hls__section_3.4_1686989774901_0.md
index 6a29fb0..80f4804 100644
--- a/pages/hls__section_3.4_1686989774901_0.md
+++ b/pages/hls__section_3.4_1686989774901_0.md
@@ -76,4 +76,11 @@ file-path:: ../assets/section_3.4_1686989774901_0.pdf
   hl-color:: yellow
   id:: 648d7726-4d29-42a5-9044-62bd69968ba1
   hl-type:: area
-  hl-stamp:: 1686992678128
\ No newline at end of file
+  hl-stamp:: 1686992678128
+- [:span]
+  ls-type:: annotation
+  hl-page:: 27
+  hl-color:: yellow
+  id:: 648d77b1-1d4a-4c69-b309-e398fccab797
+  hl-type:: area
+  hl-stamp:: 1686992817580
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index c0686e1..a35e080 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2948,7 +2948,6 @@
 							-
 					- One function of two random variables ![section 3.4.pdf](../assets/section_3.4_1686989774901_0.pdf)
 						- Definition:
-						  collapsed:: true
 							- ((648d6cfd-9414-489e-ae6f-0c37a35c6c28))
 						- Discrete case
 						  collapsed:: true
@@ -2964,19 +2963,25 @@
 								- ((648d718a-6ea6-45b9-96f7-2f89ecbf54f3))
 								- Can be written as: #flashcard
 								  id:: 648d71a6-3a5b-4ef8-b461-ab67f9b65332
+								  collapsed:: true
 									- ((648d71bc-ca55-46f9-a7d4-22a339a7f9c0))
 									- Also: ((648d71dd-ce78-49c5-a12c-58dea53bd4cc))
 									- Examples
+									  collapsed:: true
 										- Uniform distribution:
+										  collapsed:: true
 											- ((648d767e-8555-4232-8be8-ff27073ed790))
 										- Exponential distribution : 知道过程结果 #flashcard
 										  id:: 648d7634-ca1e-4b05-ae6d-dadaab66fb07
+										  collapsed:: true
 											- ((648d7691-7c7f-435a-a441-0a4314fd9e60))
 										- Normal distribution: 记结论 #flashcard
 										  id:: 648d763a-2c89-4ec8-b09c-f034965f56c8
+										  collapsed:: true
 											- ((648d769d-a3ea-4e6c-bc93-564d88d6ed38))
 							- $max(X, Y)$
-								- ((648d7726-4d29-42a5-9044-62bd69968ba1))
+								- ((648d7726-4d29-42a5-9044-62bd69968ba1)) ... and more
+								- ((648d77b1-1d4a-4c69-b309-e398fccab797))
 							- $min(X,Y)$
 							- Et.al
 			- DONE 学积分