The closed system allows energy to transfer through the boundary but not mass.

闭系允许能量通过它的边界传递,但质量不行。

麻省理工公开课 - 热力学与动力学课程节选

The libertarian says it may be a good thing if people wear seatbelts but that should be up to them and the state, the government, has no business coercing them, us, to wear seatbelts by law.

自由主义者说，系安全带也许是件好事,但这应由人们自己作主,政府没有资格,用法律来强迫人们系安全带。

耶鲁公开课 - 公正课程节选