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 			  CLOCK: [2023-06-16 Fri 15:00:23]--[2023-06-16 Fri 15:18:37] =>  00:18:14
 			  :END:
 				- Ch1
+					- ![section 1.2.pdf](../assets/section_1.2_1686899993390_0.pdf)
 					- Experiment, Sample Space and Random Event
 					- Events as Sets
+					-
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01