在一年中，平均每个家庭耗费的燃气大约为2万个字(千瓦小时)。

In a year, the average home USES about 20, 000 units (kilowatt hours) of energy via gas use.

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这种速度突增的动力来自一组电池，该电池组储有42千瓦小时的电能。

The power for these bursts of speed comes from a battery packet with a storage capacity of 42 kilowatt hours.

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最后，全封闭的电池组可提供16.5到22瓦小时的连续操作(取决于电池技术)。

Finally, a fully enclosed battery pack provides between 16.5 and 22 watt-hours of operation (depending upon cell technology).

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And,when I once took the train over to Poitiers,it took three hours, because if you go across the lines it's not good.

由此我坐火车去普瓦捷,会花三个小时,因为穿过省界的话是很不合适的

耶鲁公开课 - 1871年后的法国课程节选