diff --git a/assets/section_2.2_1686907456219_0.edn b/assets/section_2.2_1686907456219_0.edn
index 3fe6665..28a20aa 100644
--- a/assets/section_2.2_1686907456219_0.edn
+++ b/assets/section_2.2_1686907456219_0.edn
@@ -67,5 +67,34 @@
                           :rects (),
                           :page 9},
                :content {:text "[:span]", :image 1686907685844},
+               :properties {:color "yellow"}}
+              {:id #uuid "648c2be0-787e-4e1f-8d0c-b859f0d08383",
+               :page 17,
+               :position {:bounding {:x1 0,
+                                     :y1 92.68229675292969,
+                                     :x2 669.0964965820312,
+                                     :y2 342.2200469970703,
+                                     :width 725.67,
+                                     :height 544.252},
+                          :rects ({:x1 0,
+                                   :y1 92.68229675292969,
+                                   :x2 0,
+                                   :y2 115.18229675292969,
+                                   :width 725.67,
+                                   :height 544.252}
+                                  {:x1 56.686195373535156,
+                                   :y1 290.95701599121094,
+                                   :x2 669.0964965820312,
+                                   :y2 315.1237030029297,
+                                   :width 725.67,
+                                   :height 544.252}
+                                  {:x1 56.686195373535156,
+                                   :y1 318.0533905029297,
+                                   :x2 621.4563980102539,
+                                   :y2 342.2200469970703,
+                                   :width 725.67,
+                                   :height 544.252}),
+                          :page 17},
+               :content {:text "A random variable is said to be of discrete type if the number of different values it can take is finite or countably infinite."},
                :properties {:color "yellow"}}],
- :extra {:page 17}}
+ :extra {:page 22}}
diff --git a/pages/hls__section_2.2_1686907456219_0.md b/pages/hls__section_2.2_1686907456219_0.md
index 1980f8a..ba3871a 100644
--- a/pages/hls__section_2.2_1686907456219_0.md
+++ b/pages/hls__section_2.2_1686907456219_0.md
@@ -31,4 +31,10 @@ file-path:: ../assets/section_2.2_1686907456219_0.pdf
   hl-color:: yellow
   id:: 648c2b26-e92d-43f7-b8e1-60b51a2b5268
   hl-type:: area
-  hl-stamp:: 1686907685844
\ No newline at end of file
+  hl-stamp:: 1686907685844
+- A random variable is said to be of discrete type if the number of different values it can take is finite or countably infinite.
+  ls-type:: annotation
+  hl-page:: 17
+  hl-color:: yellow
+  id:: 648c2be0-787e-4e1f-8d0c-b859f0d08383
+  hl-stamp:: 1686907879808
\ No newline at end of file
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 48db8a9..f65dd19 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2699,7 +2699,8 @@
 							- ((648c2a88-3d0f-47d2-be44-21df002a1def))
 							- ((648c2abf-5c5e-4af9-9e13-bb566f3206e8))
 							- ((648c2b26-e92d-43f7-b8e1-60b51a2b5268))
-						-
+						- Discrete type
+							- Definition:  ((648c2be0-787e-4e1f-8d0c-b859f0d08383))
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01