无用功又称额外功。机械克服额外阻力（如起重机提起重物时起重机臂的重力以及绳索和滑轮间的摩擦力）所做的功，同额外功为并非我们需要又不得不做的功。
无用功
网络释义
goose chase » 无用功 we were all very tired ,because we sat down under a tree and had a rest.
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短语
做无用功 lipstick on a pig ; Flogging a dead horse
通常的无用功 unnecessary amount of work
浪费时间做无用功 Reinvent the wheel
美丽的东西最终无用功 Beautiful things end in futility
无线载体通用功能 RBCF
无功补偿用电力电容器 no-load compensating power capacitor
无功备用 Reactive power reserves
别再做无用之功 Don't beat a dead horse
双语例句原声例句
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今天我们来看攻略#1：无用功不是功
Today we focus on Gospel #1: Pseudo-work does not equal work
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但是现在预测委员会的下一步棋基本上就是无用功。
But predicting the committee's next move now is next to impossible.
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如果因此对保守派发出环保信息 那可能是无用功.
Send an environmental message to the conservative and you could lose her vote.
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I am at the point of believing," he says, "that my labor will be as useless as the commonwealth of Plato," he says in a moment of sort of uncharacteristic despair, "will be as useless as the commonwealth of Plato."
我就快相信，自己所做的这一切都将是无用功,就像柏拉图所建立的理想国一样,他曾异常绝望地这样说，就像柏拉图的理想国一样毫无意义“
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