Somebody say it real loud. Yes, the system is working on the surroundings, right? It's pushing out against them.

有人很大声的回答了，对，系统在对外做功，他把外界向外推开。

麻省理工公开课 - 热力学与动力学课程节选

to validate the entire radio before it is released to the public.

以便在对外发布之前把所有的广播功能都测试一遍。

团队的重要性 - SpeakingMax英语口语达人

The purpose here is to look at a series of processes in which temperature is held constant, and we're going to calculate how much work we get from allowing a gas to expand under various conditions.

目的是让大家了解一下,几个保持温度不变的过程，然后我们将计算,气体在不同膨胀过程中,的对外做功。

麻省理工公开课 - 热力学与动力学课程节选

The date that's sort of typical for the general phenomenon of colonization coming out of the mother cities of Greece is again that date we keep talking about, 750 roughly.

殖民,成为这一典型时期的普遍现象,古希腊人离开故土,开始了对外扩张,也就是我们一再提起的时期,大约在公元前750年

耶鲁公开课 - 古希腊历史简介课程节选

And here, in an isothermal expansion, The bath is putting back the energy that the gas is expanding or using to expand, and so the energy is flowing back into the gas through the environment in the isothermal expansion.

而在等温膨胀中，恒温环境将气体膨胀对外做功,而损失的能量又返还回来，在等温膨胀中,能量从环境,流向系统。

麻省理工公开课 - 热力学与动力学课程节选