The third thing I'm going to do, is I need to set up the right end test.

我要做的第三件事情，就是需要设置正确的完结测试。

麻省理工公开课 - 计算机科学及编程导论课程节选

You've got to place the boundary at exactly the right place, otherwise you've got a bit too much in your system or a bit too little.

你要把边界,设置在正确的位置上，否则你的系统就会要么多出一部分,要么少一部分。

麻省理工公开课 - 热力学与动力学课程节选