这个世界的幸运儿所进行的过度消费成了一个环境问题，其严重程度也许只有人口增长问题能与之相提并论。

Overconsumption by the world's fortunate is an environmental problem unmatched in severity by anything but perhaps population growth.

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污染已经成为一个严重问题，不仅对环境有害，对人类也有害。

Pollution has become a serious problem, which does harm not only to environment but also to human beings.

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但依然存在另一个恶劣的环境问题，需要它们适应，即汹涌的潮汐和偶尔袭来的飓风。

There is yet another aspect of the harsh environment that they have to adapt to, the force of tides and occasional violent storms.

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And this is in an isolated, in an adiabatic container.

这应该是个很简单的问题，桨轮处在一个与外界隔离额绝热环境中。

麻省理工公开课 - 热力学与动力学课程节选

Last year for the pieces that do vary year to year a bit, last year's first problem set challenged students to write their first or maybe second or third program using this environment called Scratch.

去年的教材有些地方有略微改动，去年的第一个问题集是让学生,在Scratch环境下,写下自己的第一或第二个或第三个程序。

哈佛公开课 - 计算机科学课程节选