One of the more conservative plans for addressing the problem calls for a reduction of 25 billion tons of carbon emissions over the next 50 years.

为解决这一问题，一项较为保守的计划要求在未来50年内减少250亿吨碳排放。

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For example, a basic aircraft carrier is made of 60,000 tons of steel.

例如，一艘基本的航空母舰是由6万吨钢铁制造的。

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A quant will troll through tons and tons of data, looking for patterns.

金融工程师会在大量数据中寻找模式。

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But in time, huge machines were built that could wash many tons of dirt at a time.

VOA: special.2010.04.25

And when we talk about any type of ion channel, there are just tons of different kinds of ion channels, and you can characterize them in a few different ways.

而当我们讨论任何一种离子通道时，离子通道有非常多种，你可以用几种不同的方法来描述它们。

麻省理工公开课 - 化学原理课程节选

Iron or steel, 800 million tons, almost a billion tons of steel.

铁或钢，每年8亿吨，几乎接近10亿的钢产量。

麻省理工公开课 - 固态化学导论课程节选

For energy, more than a billion tons of coal -- a quarter of the world's total output -- are burned every year, coating metropolitan areas with sulfur dioxide, soot and smoke.

CNN: China's industrial growth fuels major pollution problems

Countries whose mines are not mechanized, such as India, Poland and especially China--which mines about a billion tons of coal a year--need infrastructure to support high-tech machines.

FORBES: The big dig

Put a few tons of broccoli in a typical boxcar in Walla Walla, Wash.

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