diff --git a/assets/section_2.5_1686968005870_0.edn b/assets/section_2.5_1686968005870_0.edn
index 2625bd5..7d34ed3 100644
--- a/assets/section_2.5_1686968005870_0.edn
+++ b/assets/section_2.5_1686968005870_0.edn
@@ -21,5 +21,17 @@
                           :rects (),
                           :page 4},
                :content {:text "[:span]", :image 1686969099465},
+               :properties {:color "yellow"}}
+              {:id #uuid "648d1bfd-fcfb-43ed-801e-0de972c24cb1",
+               :page 6,
+               :position {:bounding {:x1 37,
+                                     :y1 63.583251953125,
+                                     :x2 640,
+                                     :y2 246.583251953125,
+                                     :width 677.2919999999999,
+                                     :height 507.96853333333326},
+                          :rects (),
+                          :page 6},
+               :content {:text "[:span]", :image 1686969339492},
                :properties {:color "yellow"}}],
- :extra {:page 5}}
+ :extra {:page 6}}
diff --git a/assets/section_2.5_1686968005870_0/6_648d1bfd-fcfb-43ed-801e-0de972c24cb1_1686969339492.png b/assets/section_2.5_1686968005870_0/6_648d1bfd-fcfb-43ed-801e-0de972c24cb1_1686969339492.png
new file mode 100644
index 0000000..7e2637a
Binary files /dev/null and b/assets/section_2.5_1686968005870_0/6_648d1bfd-fcfb-43ed-801e-0de972c24cb1_1686969339492.png differ
diff --git a/pages/hls__section_2.5_1686968005870_0.md b/pages/hls__section_2.5_1686968005870_0.md
index b4684c7..844f19b 100644
--- a/pages/hls__section_2.5_1686968005870_0.md
+++ b/pages/hls__section_2.5_1686968005870_0.md
@@ -14,4 +14,11 @@ file-path:: ../assets/section_2.5_1686968005870_0.pdf
   hl-color:: yellow
   id:: 648d1b0d-fdbf-4373-84a8-a072590881a1
   hl-type:: area
-  hl-stamp:: 1686969099465
\ No newline at end of file
+  hl-stamp:: 1686969099465
+- [:span]
+  ls-type:: annotation
+  hl-page:: 6
+  hl-color:: yellow
+  id:: 648d1bfd-fcfb-43ed-801e-0de972c24cb1
+  hl-type:: area
+  hl-stamp:: 1686969339492
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 7e4420a..e6ca46c 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2820,7 +2820,10 @@
 						- Uniform Distribution
 							- Definition, pdf and df :-> ((648d1aea-71f3-473b-8e72-d1ee4e629a91))
 							- ((648d1b0d-fdbf-4373-84a8-a072590881a1))
-							-
+							- Standard distribution ((648d1b0d-fdbf-4373-84a8-a072590881a1))
+							- Properties
+								- mean and variance :-> ((648d1bfd-fcfb-43ed-801e-0de972c24cb1))
+								-
 						- Exponential Distribution
 						- Normal Distribution
 			- LATER 学积分