So we have system insulated from the outside world, and we have two bulbs.

我们有一个与环境隔绝的系统，和两个腔体。

麻省理工公开课 - 热力学与动力学课程节选

It's insulated. It's a closed system. In fact, it's an isolated system. There's no energy or matter that can go through that boundary.

系统指的，是盒子里的东西,它是封闭孤立的。

麻省理工公开课 - 热力学与动力学课程节选