Definition: when or how something moves Level: C2
船的晃动让他感到恶心。
The ___motion of the boat made him feel sick.
喷气发动机引起的空气运动使窗户颤动。
The ___motion of the air caused by the jet engines makes the windows tremble.
观看云朵在天空中缓慢移动令人平静。
The slow ___motion of the clouds across the sky was calming to watch.
