名詞 mobility:

1. the quality of moving freely

1. In modern warfare, mobility and sophisticated weapons are more important than weight of numbers.
   在現(xiàn)代戰(zhàn)爭中，機(jī)動性和先進(jìn)武器比人多勢眾更為重要。
2. A private car gives a much greater degree of comfort and mobility.
   私人小汽車能給人很大的舒服和機(jī)動性。

mo.bil.i.ty

n.（名詞）
The quality or state of being mobile.
易動性：易動的性質(zhì)或狀態(tài)
The movement of people, as from one social group, class, or level to another:
流動：人的移動，如從一個(gè)社會集團(tuán)，階級或階層移向另一社會集團(tuán)，階級或階層：
例句：
.There`s been . . . restructuring of industry and downward mobility for Americans as a whole.(Lawrence W. Sherman)
.曾有…工業(yè)的調(diào)整時(shí)期，總體而言當(dāng)時(shí)的美國人向下層社會階層流動.(勞倫斯W.謝爾曼)