n.流动性，移动性，<社>流动，机动性
Prior to the nineteenth century, there were almost no channels of social mobility.
19世纪以前几乎不存在社会流动的渠道。
Mobility is very important in guerrilla warfare.
机动性在游击战中至关重要.
She has limited mobility in her arms.
她的双臂只能做有限的活动.
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