mobility
/məʊˈbɪlətɪ/noun
mass noun
1- the ability to move or be moved freely and easily移动能力; 灵活性; 流动性; 机动性：
this exercise helps retain mobility in the damaged joints.
这项运动有助于受损关节保持活动能力。
1.1
- the ability to move between different levels in society or employment（在社会地位或职业间）流动：
industrialization would open up increasing chances of social mobility.
工业化给社会流动提供越来越多的机会。