Houses built before 1939 use about 50% more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that expand over time and let in more outside air.

1939年以前建造的房屋每平方英尺消耗的能源比2000年以后建造的房屋多50%，这主要是由于微小的裂缝随着时间的推移而扩大，更多的外部空气进入了裂缝。

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At the same time, surveys on consumers show that they also care about minimizing energy use and reducing waste.

与此同时，对消费者的调查显示，他们也对减少能源使用和减少浪费表示关心。

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Last time we talked about photosynthesis, the process by which plants use light to convert carbon dioxide and water into food.

上次我们讨论了光合作用，即植物利用光将二氧化碳和水转化为食物的过程。

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What was neat about it is before that time, the predominant species to use for air conditioning or refrigeration was ammonia.

在这之前是很整洁的，之前最主要的用于空调或者冰箱的,物质是氨。

麻省理工公开课 - 固态化学导论课程节选

This is the sort of thing that people who do numerical programming worry about all the time. And there are a lot of a little tricks they use to deal with that, they'll perturb it a little bit, things like that.

这是一些做计算编程,要时刻注意的问题,当然有的时候我们还需要,应对一些假象，比如像这样被扰乱的。

麻省理工公开课 - 计算机科学及编程导论课程节选

And we talked about the equation you can use for radial nodes last time, and that's just n minus 1 minus l.

我们讲过这个用于,计算径向节点的方程，也就是ｎ减去ｌ减去１

麻省理工公开课 - 化学原理课程节选

Always a phrase or two about the pointlessness of the assignment in relation to the use of time and to things he might otherwise be doing: e.g.

NEWYORKER: The Tree Line, Kansas, 1934

There has been some concern about stated energy use versus actually energy use for quite some time and the USGBC addressed this concern with the mandated energy use requirement of LEED v3.

FORBES: Energy-hogging LEED-certified buildings cause concern

Since everybody on forbes.com loves to talk about Warren Buffett all the time, I will use Berkshire Hathaway.

FORBES: CPA to Tax Policy Wonks - Can You at Least Look at Our Numbers ?