Many worm gears have an interesting property that no other gear set has: the worm can easily turn the gear, but the gear cannot turn the worm.

很多蜗轮蜗杆具有其他齿轮传动所没有的一种有趣的性质：蜗杆能很容易地带动涡轮，但是涡轮却带不动蜗杆。

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To change the gear ratio, most automatic transmissions use planetary gear set.

为了能够改变变速器的传动比，大多数自动变速器使用了行星齿轮机构。

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This paper analyzes the feasibility of planetary gear set as clutch from the perspective of design.

本文从设计角度分析采用行星齿轮组作为离合器机构的可行性。

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To it I have upgraded the wheels and the gear set.

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"We shouldn't let the coach get away with saying all he does is drag the bags out and set the gear up, " the Aussie skipper added.

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Sure, the watches were inspired by jewelry and considered accessories as much as practicalities, but they still served to set the gear in motion toward a trend toward wristwatches for everyone.

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