1、Each piston has a crank arm attached to a crankshaft.
每個活塞有曲柄連接曲軸臂。

2、They sit pretty close to the crank arm and we've been quite pleased with them so far.
他們坐在非常接近曲柄，我們已經(jīng)對他們相當(dāng)滿意為止。

3、To power the machine, several people would turn a crank arm connected to the vacuum pump.
要操作此機器，需要幾個人轉(zhuǎn)動與真空泵相連的曲柄裝置。

4、Affix using one of the crank arm fixing bolts.
詞綴使用其中的一個曲柄臂固定螺栓。

crank arm翻譯