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crank web
Affix using one of the crank arm fixing bolts.
词缀使用其中的一个曲柄臂固定螺栓。
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Each piston has a crank arm attached to a crankshaft.
每个活塞有曲柄连接曲轴臂。
To power the machine, several people would turn a crank arm connected to the vacuum pump.
要操作此机器，需要几个人转动与真空泵相连的曲柄装置。
It survived 250, 000 rotations of the crank arm, what would come with about a decade of heavy use.
FORBES: Spinning Wheels
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