"Flip" is a short, sharp word for a short, sharp action. "Flip-flop" arose in imitation of the action of going quickly back and forth.

他们听上去都是拟声词 flip音节短促尖锐 用以描述快捷疾速的动作.flip-flop的发音模拟快速往复的动作.flap听上去不正象旗帜和船帆在风中拍打的声音吗?

youdao

Pretty sharp analysis. I think we are all waiting for some action, and weary of the words.

非常敏锐的分析，我想，我们也在等待更多的行动，对口头承诺有些疲倦了。

youdao

Acids are chemical compounds that, in water solution, have a sharp taste, a corrosive action on metals, the ability to turn certain blue vegetable dyes red.

酸是一种化合物，它在溶于水时具有强烈的气味，它对金属具有腐蚀的作用，并且它具有把某些蓝色植物染料变红的能力。

youdao

Users can lock-on to fast moving subjects throughout the frame using 3D tracking to create sharp images of fast action, or use one of the other modes including single point AF, Dynamic AF and Auto-Area AF.

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There is strong and often inventive action, genuinely sharp dialogue, and a real story being told.

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But without decisive action and a sharp focus, you might never get a chance to refuel.

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