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 it is electric and you push a button to make it ring.
有时它是电的，而且你推动一个钮扣使它响。
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。
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