diff --git a/assets/section_2.3_1686916498071_0.edn b/assets/section_2.3_1686916498071_0.edn
index e52038a..ea26399 100644
--- a/assets/section_2.3_1686916498071_0.edn
+++ b/assets/section_2.3_1686916498071_0.edn
@@ -193,5 +193,17 @@
                           :rects (),
                           :page 36},
                :content {:text "[:span]", :image 1686919984593},
+               :properties {:color "yellow"}}
+              {:id #uuid "648c5c3a-160a-41ff-9cc7-83e750e3e8fa",
+               :page 37,
+               :position {:bounding {:x1 48,
+                                     :y1 58.08203125,
+                                     :x2 687,
+                                     :y2 543.9023208618164,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects (),
+                          :page 37},
+               :content {:text "[:span]", :image 1686920250512},
                :properties {:color "yellow"}}],
- :extra {:page 36}}
+ :extra {:page 38}}
diff --git a/assets/section_2.3_1686916498071_0/37_648c5c3a-160a-41ff-9cc7-83e750e3e8fa_1686920250512.png b/assets/section_2.3_1686916498071_0/37_648c5c3a-160a-41ff-9cc7-83e750e3e8fa_1686920250512.png
new file mode 100644
index 0000000..a462513
Binary files /dev/null and b/assets/section_2.3_1686916498071_0/37_648c5c3a-160a-41ff-9cc7-83e750e3e8fa_1686920250512.png differ
diff --git a/pages/hls__section_2.3_1686916498071_0.md b/pages/hls__section_2.3_1686916498071_0.md
index 90589cc..81165fc 100644
--- a/pages/hls__section_2.3_1686916498071_0.md
+++ b/pages/hls__section_2.3_1686916498071_0.md
@@ -96,4 +96,11 @@ file-path:: ../assets/section_2.3_1686916498071_0.pdf
   hl-color:: yellow
   id:: 648c5b30-e75f-4f0c-bb7d-985442728fbe
   hl-type:: area
-  hl-stamp:: 1686919984593
\ No newline at end of file
+  hl-stamp:: 1686919984593
+- [:span]
+  ls-type:: annotation
+  hl-page:: 37
+  hl-color:: yellow
+  id:: 648c5c3a-160a-41ff-9cc7-83e750e3e8fa
+  hl-type:: area
+  hl-stamp:: 1686920250512
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 6644f7a..60110ee 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2742,6 +2742,7 @@
 								- ((648c57d7-8f76-4520-8bc0-b54953bbe4cf))
 								- Standard variance: ((648c57e8-e79a-48b6-98cf-f68dc0e5277e))
 								- Properties
+								  collapsed:: true
 									- ((648c5982-4b4f-4935-ad4f-de93462bc564))
 									- ((648c5a58-62da-4c15-b22d-00e839b8f909))
 								- Examples
@@ -2749,7 +2750,8 @@
 									- ((648c5b1c-533d-434a-b118-6a61cc9abb3a)) #flashcard
 									  collapsed:: true
 										- ((648c5b30-e75f-4f0c-bb7d-985442728fbe))
-								-
+						- Moments of random variable
+							- Definition :-> ((648c5c3a-160a-41ff-9cc7-83e750e3e8fa))
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01