diff --git a/assets/section_3.4_1686989774901_0.edn b/assets/section_3.4_1686989774901_0.edn
index 5c3cbc5..b1343cd 100644
--- a/assets/section_3.4_1686989774901_0.edn
+++ b/assets/section_3.4_1686989774901_0.edn
@@ -62,5 +62,29 @@
                                    :height 544.252}),
                           :page 14},
                :content {:text "1. The case of X + Y"},
-               :properties {:color "blue"}}],
- :extra {:page 12}}
+               :properties {:color "blue"}}
+              {:id #uuid "648d71bc-ca55-46f9-a7d4-22a339a7f9c0",
+               :page 15,
+               :position {:bounding {:x1 43,
+                                     :y1 389.3330078125,
+                                     :x2 696,
+                                     :y2 537.3330078125,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects (),
+                          :page 15},
+               :content {:text "[:span]", :image 1686991291701},
+               :properties {:color "yellow"}}
+              {:id #uuid "648d71dd-ce78-49c5-a12c-58dea53bd4cc",
+               :page 16,
+               :position {:bounding {:x1 44,
+                                     :y1 187.3330078125,
+                                     :x2 697.1640625,
+                                     :y2 333.3291015625,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects (),
+                          :page 16},
+               :content {:text "[:span]", :image 1686991327483},
+               :properties {:color "yellow"}}],
+ :extra {:page 16}}
diff --git a/assets/section_3.4_1686989774901_0/15_648d71bc-ca55-46f9-a7d4-22a339a7f9c0_1686991291701.png b/assets/section_3.4_1686989774901_0/15_648d71bc-ca55-46f9-a7d4-22a339a7f9c0_1686991291701.png
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index 0000000..cd1047b
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diff --git a/assets/section_3.4_1686989774901_0/16_648d71dd-ce78-49c5-a12c-58dea53bd4cc_1686991327483.png b/assets/section_3.4_1686989774901_0/16_648d71dd-ce78-49c5-a12c-58dea53bd4cc_1686991327483.png
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diff --git a/pages/hls__section_3.4_1686989774901_0.md b/pages/hls__section_3.4_1686989774901_0.md
index 5d34aa5..ed2a0ab 100644
--- a/pages/hls__section_3.4_1686989774901_0.md
+++ b/pages/hls__section_3.4_1686989774901_0.md
@@ -34,4 +34,18 @@ file-path:: ../assets/section_3.4_1686989774901_0.pdf
   hl-color:: blue
   id:: 648d718a-6ea6-45b9-96f7-2f89ecbf54f3
   hl-stamp:: 1686991243753
-  1. The case of X + Y
\ No newline at end of file
+  1. The case of X + Y
+- [:span]
+  ls-type:: annotation
+  hl-page:: 15
+  hl-color:: yellow
+  id:: 648d71bc-ca55-46f9-a7d4-22a339a7f9c0
+  hl-type:: area
+  hl-stamp:: 1686991291701
+- [:span]
+  ls-type:: annotation
+  hl-page:: 16
+  hl-color:: yellow
+  id:: 648d71dd-ce78-49c5-a12c-58dea53bd4cc
+  hl-type:: area
+  hl-stamp:: 1686991327483
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 7a7c1c5..c6698ec 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2947,6 +2947,7 @@
 						- Continuous case
 							- $X + Y$
 								- ((648d718a-6ea6-45b9-96f7-2f89ecbf54f3))
+								- Can be written as: :-> ((648d71bc-ca55-46f9-a7d4-22a339a7f9c0))
 							- $min(X,Y)$
 								-
 							- $max(X, Y)$