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4. Select this "Block" figure, right-click, and click "Block Editor" in the shortcut menu to enter "Block Editor".This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,最终季奥利弗（约翰·霍华德·戴维斯 John Howard Davies 饰）一出生就被抛弃，在孤儿院生活了九年之后，他被送到了棺材铺当学徒。无法忍受苦不堪言的生活，奥利弗从师傅的身边逃跑来到了巴黎，在那里，他结识了扒手法钦（亚利克·基尼斯 Alec Guinness 饰）。就这样，奥利弗被迫开始了自己的扒手生涯。(1) Normal detection of contacts. The normal detection of contacts refers to the detection of contacts when the control coil is not energized. The normally open contacts are open with infinite resistance, and the normally closed contacts are closed with resistance close to 0. The normal detection of the normally open contacts of the time relay is shown in the following figure.　　改编自吴明益同名小说，金马得奖导演杨雅喆指导。2月20日起，周周上线。