Poor rotation, low swinging arms and cross-overs are the major causes of shoulder injury.

不好的身体滚动，低摆臂和过中线是造成肩伤的主要原因。

youdao

Conclusions: We concluded that the expandable IM femoral nail, when tested in purely axial rotation, has poor rotational stability compared with the standard locked IM femoral nail.

结论：我们认为当单纯进行轴向旋转测试时，和标准的锁定股骨髓内钉相比，膨胀股骨髓内钉的抗旋转稳定性差。

youdao

He says the soil is worn out, partially due to poor crop rotation.

VOA: standard.2010.04.01

Shallow plowing, no crop rotation, inadequate seedbeds, and other habits sustained by lore and tradition resulted in poor production and soil exhaustion.

NEWYORKER: Testing, Testing