Through lots of research, Cress found out that Americans use about 500 million straws every day.

通过大量的研究，Cress 发现美国人每天使用大约5亿根吸管。

youdao

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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In my case I want to use about 3 pixels of feather.

在这里，我使用了3个像素的羽化。

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He says his team's research is influenced by questions in evolutionary biology about why people and groups use costly punishment.

VOA: special.2009.03.03

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

Use this pattern whenever you want to find out about the timing of an event in the past, present, or future.

当你想知道过去、现在或者未来某件事发生的时间时，你都可以使用这个句型。

When 课堂 - SpeakingMax英语口语达人

"We use about nine barrels of oil each per year in the UK, " he says.

CNN: The towns taking control of their future

They now use about half as much water per gallon of ethanol as they did a decade ago.

ECONOMIST: New reasons to be suspicious of ethanol

Compact fluorescents use about one-third as much electricity as incandescent bulbs to produce the same amount of light.

ECONOMIST: Green homes