diff --git a/assets/section_2.3_1686916498071_0.edn b/assets/section_2.3_1686916498071_0.edn
index 69db9fb..f641ec6 100644
--- a/assets/section_2.3_1686916498071_0.edn
+++ b/assets/section_2.3_1686916498071_0.edn
@@ -33,5 +33,17 @@
                           :rects (),
                           :page 16},
                :content {:text "[:span]", :image 1686917848708},
+               :properties {:color "yellow"}}
+              {:id #uuid "648c5381-49cd-4701-ba48-31c0e21474a7",
+               :page 20,
+               :position {:bounding {:x1 33,
+                                     :y1 63.0830078125,
+                                     :x2 699,
+                                     :y2 524.0830078125,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects (),
+                          :page 20},
+               :content {:text "[:span]", :image 1686918015117},
                :properties {:color "yellow"}}],
  :extra {:page 20}}
diff --git a/assets/section_2.3_1686916498071_0/20_648c5381-49cd-4701-ba48-31c0e21474a7_1686918015117.png b/assets/section_2.3_1686916498071_0/20_648c5381-49cd-4701-ba48-31c0e21474a7_1686918015117.png
new file mode 100644
index 0000000..50f5223
Binary files /dev/null and b/assets/section_2.3_1686916498071_0/20_648c5381-49cd-4701-ba48-31c0e21474a7_1686918015117.png differ
diff --git a/pages/hls__section_2.3_1686916498071_0.md b/pages/hls__section_2.3_1686916498071_0.md
index 80e1b70..ed4686f 100644
--- a/pages/hls__section_2.3_1686916498071_0.md
+++ b/pages/hls__section_2.3_1686916498071_0.md
@@ -21,4 +21,11 @@ file-path:: ../assets/section_2.3_1686916498071_0.pdf
   hl-color:: yellow
   id:: 648c52d9-ea03-4835-8080-52ba5e6c3122
   hl-type:: area
-  hl-stamp:: 1686917848708
\ No newline at end of file
+  hl-stamp:: 1686917848708
+- [:span]
+  ls-type:: annotation
+  hl-page:: 20
+  hl-color:: yellow
+  id:: 648c5381-49cd-4701-ba48-31c0e21474a7
+  hl-type:: area
+  hl-stamp:: 1686918015117
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index b74e265..5a19c7b 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2722,9 +2722,13 @@
 						- Expectation
 							- Definitions :-> ((648c4e9e-5515-4da3-bc6b-39d6969f5f14))
 							- Examples:
+							  collapsed:: true
 								- ((648c5298-fb84-4e9c-b816-7df1a7ad9a66)) #flashcard
+								  collapsed:: true
 									- ((648c52d9-ea03-4835-8080-52ba5e6c3122))
-							-
+							- Expectation of compound functions:
+							  collapsed:: true
+								- ((648c5381-49cd-4701-ba48-31c0e21474a7))
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01