And yet get a valid test. Sometimes it can be timing. If you're running multiple processes.

有些时候当你运行多线程时,是因为时间的原因。

麻省理工公开课 - 计算机科学及编程导论课程节选

You have to be careful that this first law of Newton is not valid for everybody.

大家需要注意的是,牛顿第一定律并非所有情况都适用

耶鲁公开课 - 基础物理课程节选