Safety has also come into question, as some of the lithium-ion batteries — widely believed to be the key to making viable electric cars — have shown a tendency to overheat and sometimes catch fire.
电动车的安全性也受到质疑，被普遍视为电动轿车商业化关键部件的锂离子电池有时可能出现过热甚至起火的现象。
Sometimes we also helped to maintain he hospital's small electric power station.
有时候我们也要帮忙维护医院的小发电机。
In the past, such well-known corporations as General Electric and Boeing have sometimes paid little or no tax by taking advantage of various special tax breaks.
过去，如通用电器公司和波音公司这样的知名企业，有时会利用各种特殊税的空子少缴税甚至不缴税。
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