節約用電的用法和樣例：
例句
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告訴孩子在離開(kāi)房間時(shí)關(guān)掉所有的燈，以節約用電。
Tell the boy to switch off all lights as he leaves the room, to save electricity. -
總統關(guān)于節約用電的講話(huà)被接受了，人們開(kāi)始做`到人離燈滅了。
The president's speech about the need for saving power got home, and everyone started turning off lights.
