1. The car also has a curious ambivalence: it creates and then it destroys mobility.
    小汽车还具有令人奇怪的两重性：它能创造交通之便，却又能破坏交通之便。

2. The cavalry is much superior in mobility to the infantry.
    骑兵的机动性远优于步兵。

3. At the least, it explains the greater job stability in Japan, in contrast to the great job mobility in America.
    至少，它说明了美国的工作流动性大和相比而言日本的工作稳定性极高的原因。