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击球的力量来自拍头的速度。
Power comes from racquet head speed.
youdao
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提高搅拌头的旋转速度可以成比例地提高焊接温度；
The welding temperature was directly proportional to rotation speed.
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齿轮头能够改变的速度很快。
Gear head enables to change speeds quickly.
youdao
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齿轮头能够改变的速度很快。
Gear head enables to change speeds quickly.
youdao