质量和能量——我是个开系，对吧？

Mass and energy — I'm an open system, right?

youdao

因此热水瓶不是个开系。

So the thermos is not an open system.

youdao

系统可以是开系，可以是闭系，或是孤立系。

The system can be an open system, or it can be a closed system, or it can be isolated.

youdao

The system can be an open system, or it can be a closed system, or it can be isolated.

系统可以是开系，可以是闭系，或是孤立系。

麻省理工公开课 - 热力学与动力学课程节选

An open system, as the name describes, allows mass and energy to freely flow through the boundary.

开系，顾名思义，允许质量和能量自由地,流过它的边界。

麻省理工公开课 - 热力学与动力学课程节选

The thermos, with the lid on top, It's not a open system your coffee is going to stay warm or hot in the thermos.

顶部盖了盖子的热水瓶，不是开系,你希望你的咖啡在热水瓶里面保持温暖,或滚烫。

麻省理工公开课 - 热力学与动力学课程节选