This is actually very representative of when you do research in the laboratory, you will find often things do not work quite exactly as they worked 20 minutes ago when you just checked it in your office, for example.

在实验室做研究时,这个实际上是非常具有代表性的，举个例子,当时只是在办公室核查它时,你经常会发现事物无法,像它们20分钟之前那样精确的工作。

麻省理工公开课 - 化学原理课程节选