So this becomes where defining the system and the boundaries and everything becomes important.

因此问题就变成了,如何定义系统和边界,那么一切都变得重要了。

麻省理工公开课 - 热力学与动力学课程节选

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

And then between the system and the surroundings is the boundary.

系统和环境之间的,是边界。

麻省理工公开课 - 热力学与动力学课程节选