diff --git a/assets/section_2.1_1686906920851_0.edn b/assets/section_2.1_1686906920851_0.edn
index b36ec1d..6059a8c 100644
--- a/assets/section_2.1_1686906920851_0.edn
+++ b/assets/section_2.1_1686906920851_0.edn
@@ -14,5 +14,17 @@
                                    :height 453.54333333333324}),
                           :page 4},
                :content {:text "Definition"},
+               :properties {:color "yellow"}}
+              {:id #uuid "648c290a-3532-4e56-8536-258daf7b00a7",
+               :page 5,
+               :position {:bounding {:x1 54,
+                                     :y1 123.5,
+                                     :x2 966,
+                                     :y2 724.5,
+                                     :width 1015.9379999999999,
+                                     :height 761.9527999999999},
+                          :rects (),
+                          :page 5},
+               :content {:text "[:span]", :image 1686907140964},
                :properties {:color "yellow"}}],
- :extra {:page 5}}
+ :extra {:page 9}}
diff --git a/assets/section_2.1_1686906920851_0/5_648c290a-3532-4e56-8536-258daf7b00a7_1686907140964.png b/assets/section_2.1_1686906920851_0/5_648c290a-3532-4e56-8536-258daf7b00a7_1686907140964.png
new file mode 100644
index 0000000..abbb30f
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diff --git a/pages/hls__section_2.1_1686906920851_0.md b/pages/hls__section_2.1_1686906920851_0.md
index cbf9804..b274927 100644
--- a/pages/hls__section_2.1_1686906920851_0.md
+++ b/pages/hls__section_2.1_1686906920851_0.md
@@ -5,4 +5,11 @@ file-path:: ../assets/section_2.1_1686906920851_0.pdf
   ls-type:: annotation
   hl-page:: 4
   hl-color:: yellow
-  id:: 648c2860-5454-45f1-80f8-1c85bce84fd1
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+  id:: 648c2860-5454-45f1-80f8-1c85bce84fd1
+- [:span]
+  ls-type:: annotation
+  hl-page:: 5
+  hl-color:: yellow
+  id:: 648c290a-3532-4e56-8536-258daf7b00a7
+  hl-type:: area
+  hl-stamp:: 1686907140964
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 8a1d61f..25183aa 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2691,6 +2691,7 @@
 				  :END:
 					- The Definition of a Random Variable ![section 2.1.pdf](../assets/section_2.1_1686906920851_0.pdf)
 						- ((648c2860-5454-45f1-80f8-1c85bce84fd1))
+						- ((648c290a-3532-4e56-8536-258daf7b00a7))
 					-
 			- LATER 学积分
 			  :LOGBOOK: