engine 发表于 2020-4-21 20:05:24

齿轮动画

看后感触颇多

http://v.qq.com/x/page/x0619e4ioq1.html

spring 发表于 2020-4-21 23:43:19

If we want to change the world,we need to change the way it works. Help us create equality through education!
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