当遇到不平坦的地面时要格外小心—残渣和裂缝可能导致突然的停止并使动作不受控制。

Be extra cautious when heeling on uneven surface - debris and crevices can cause sudden stops and uncontrolled movements.

youdao

她做了一个扇扇子的动作，假装使自己凉快一些。

She made a fanning motion, pretending to cool herself off.

《柯林斯英汉双解大词典》

这个动作使那些睡眠呼吸中止症患者——巨大的鼾声危及健康——能够不再打鼾。

The motion should push sufferers of sleep apnoea—the loud form of snoring that can be dangerous to health—into a position where they no longer snore.

youdao

But another possibility is once you do something it's kind of hard to stop.

但也有可能是因为,婴儿很难使自己的惯性动作停下来

耶鲁公开课 - 心理学导论课程节选

So, there's a continuum of electrical connection in the heart that allows an action potential to sweep across the surface of the heart and for the heart to beat in a coordinated fashion.

所以 心脏细胞有电偶联的连结组织,以使动作电位平稳在细胞表面传递,保证心脏的协调性跳动

耶鲁公开课 - 生物医学工程探索课程节选