diff --git a/assets/section_3.4_1686989774901_0.edn b/assets/section_3.4_1686989774901_0.edn
index 23892f6..e213b4f 100644
--- a/assets/section_3.4_1686989774901_0.edn
+++ b/assets/section_3.4_1686989774901_0.edn
@@ -146,5 +146,17 @@
                           :rects (),
                           :page 27},
                :content {:text "[:span]", :image 1686992817580},
+               :properties {:color "yellow"}}
+              {:id #uuid "648d7abf-b5e7-4d91-b909-20d45c354049",
+               :page 31,
+               :position {:bounding {:x1 28,
+                                     :y1 76.7490234375,
+                                     :x2 690,
+                                     :y2 235.7490234375,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects (),
+                          :page 31},
+               :content {:text "[:span]", :image 1686993599057},
                :properties {:color "yellow"}}],
  :extra {:page 30}}
diff --git a/assets/section_3.4_1686989774901_0/31_648d7abf-b5e7-4d91-b909-20d45c354049_1686993599057.png b/assets/section_3.4_1686989774901_0/31_648d7abf-b5e7-4d91-b909-20d45c354049_1686993599057.png
new file mode 100644
index 0000000..77d3658
Binary files /dev/null and b/assets/section_3.4_1686989774901_0/31_648d7abf-b5e7-4d91-b909-20d45c354049_1686993599057.png differ
diff --git a/pages/hls__section_3.4_1686989774901_0.md b/pages/hls__section_3.4_1686989774901_0.md
index 80f4804..0adefd3 100644
--- a/pages/hls__section_3.4_1686989774901_0.md
+++ b/pages/hls__section_3.4_1686989774901_0.md
@@ -83,4 +83,11 @@ file-path:: ../assets/section_3.4_1686989774901_0.pdf
   hl-color:: yellow
   id:: 648d77b1-1d4a-4c69-b309-e398fccab797
   hl-type:: area
-  hl-stamp:: 1686992817580
\ No newline at end of file
+  hl-stamp:: 1686992817580
+- [:span]
+  ls-type:: annotation
+  hl-page:: 31
+  hl-color:: yellow
+  id:: 648d7abf-b5e7-4d91-b909-20d45c354049
+  hl-type:: area
+  hl-stamp:: 1686993599057
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 87b791b..2f75278 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2983,8 +2983,10 @@
 								- ((648d7726-4d29-42a5-9044-62bd69968ba1)) ... and more
 								- if $$X$$ and $$Y$$ are independent: ((648d77b1-1d4a-4c69-b309-e398fccab797))
 							- $min(X,Y)$
+								- similar to max
+							- Example
+								- ((648d7abf-b5e7-4d91-b909-20d45c354049))
 								-
-							- Et.al
 			- DONE 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01