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3. Basic Handling of Activity ExceptionThe observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:Note another point, vertical version of the shooting game, please press select + start to enter the settingsCrazy Wand Method: 100 crazy points, total damage * (1 +0.6).5. At the same time, press and hold the volume reduction key on the left side of the mobile phone;汪魁坐在凳子上，伸长脖子，凑近她耳边，跟狗似的吸吸鼻子，然后皱眉道：这味儿……酸，还有些馊味……汪老三——黎章羞愤欲绝，再也顾不得装豪迈了，站起身冲着汪魁怒喝。When she returns to work and encounters problems, she has instinctive excitement. In solving the problem, she found her own sense of existence and value. This is also her survival support.