PLUG in your toaster—or your television or your vacuum cleaner—and the electricity that surges through it is an alternating current.

当你为你的吐司炉——或者电视、吸尘器——插好插头、打开电源时，电能便以交流电的形式为这些家用电器供电。

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I went down on one knee to plug in the vacuum cleaner.

我单腿跪下插上吸尘器插头。

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If the firing end is wet, make sure you clean the spark plug with a quick drying cleaner. (Examples: contact cleaner or brake cleaner).

如果点火端是湿的，确认使用快速清洁剂清洁火花塞。 （例如：精密电子清洁剂或刹车系统清洁剂）；

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The benchmark study, by the Natural Resources Defense Council and the Electric Power Research Institute (EPRI), found that plug-in hybrids are cleaner than regular cars in each of nine scenarios.

FORBES: Electric Cars Aren't Green, Says Ph.D.