On some pumpers, the rotary counterbalance can be adjusted by shifting the position on the crank arms.

在某些抽油机上，旋转平衡块可由改变其在曲柄臂上的位置进行调整。

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Crank arms attached to this platform are made from 7000-series aluminum, and to keep it light, the platforms that hold bikers are made of carbon fiber.

附连着这个平台的曲臂由7000号铝制成，为了保持车子轻便，承载车手的平台均用碳纤制成。

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This paper introduces a new type of elastic guiding mechanism developed for quartz force sensor It consists of parallel quad crank arms connected by flexible hinges.

提出了一种新型的双平行四连杆柔性铰链弹性导向结构，用作石英力传感器的力导向元件。

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Eventually, I began pausing for a few seconds between each crank of the reel, allowing my shoulders and arms a brief rest.

WSJ: Fishing for Shark in Destin, Fla.

After knee replacement surgery a few years ago, Traum stopped running himself and switched to a hand-crank wheelchair, which is low, has three wheels and is moved by the user's arms.

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