Make sure you have batteries that are in a good state of charge in your calculator.

确保你的计算器电池,处在一个良好的状态。

麻省理工公开课 - 固态化学导论课程节选

It's not a good thing if you're just looping and checking some condition, but never actually changing the state of the world.

这不是一个好事情，如果你只是循环,检查一些条件，但是永远不要改变世界上的国家。

哈佛公开课 - 计算机科学课程节选