> Yeah, so when green flag clicked, and that's kind of the very explicit way of saying when you start this program by clicking in the green flag, here is what's gonna get executed first.

>，是的，“点击绿旗“,就是用这种直白的方式告诉你,你需要点击这个绿旗才能启动整个程序，这是程序生效的入口。

哈佛公开课 - 计算机科学课程节选