self.file.close()
DRM, as an industry institution, has an almost comically bad track record when it comes to actually protecting content. Denuvo which is perhaps the most sophisticated game DRM ever deployed commercially has been cracked for virtually every major game it’s protected, usually within weeks of release. Every DVD ever made is trivially rippable. Every Blu-ray. Every streaming service has been ripped by someone, somewhere.
，这一点在雷电模拟器官方版本下载中也有详细论述
另外就是拉链、扣子这种东西怎么系。有时候孩子很乐意自己穿脱，但是学习系扣子会有一些情绪崩溃的时候，比如系不上，系串了会显得急躁，有时候还会给自己急哭了。这都没关系，安抚情绪，鼓励她，然后手把手多教几遍，在让她每天练习就行。
The performance impact on typical applications will be much smaller, since they don’t usually present walls of icons in their UI.