If you've ever been using some program, you did something completely innocuous, pull something down from a menu, click a button, you didn't do anything wrong and yet all of a sudden the thing just starts hanging there or you get a little spinning beach ball or the hour glass or whatever it is.

如果你之前在用一些程序，做一些无伤大雅的事情，拉下一个菜单，点击一个按钮，你没有做任何错误的事情,突然间有东西开始一直运行,或者一个沙滩上的小球旋转,或滴漏或是别的什么。

哈佛公开课 - 计算机科学课程节选

And there were many people trying to resolve the conflict, not just in the Middle East,else in the world, with very good intentions but very often making inadvertently the matters worse.

有很多人都试图解决冲突，不只在中东，世界各地都有这种情况，人们都心存好意,但往往在不经意间使事情变得更糟。

哈佛公开课 - 幸福课课程节选