随着年龄增长，人们的行动能力逐渐下降。

As people age, their ___mobility tends to decrease gradually.

良好的教育背景可以增加社会流动性，帮助人们获得更好的工作机会。

A good education can improve social ___mobility and help people get better job opportunities.

这款应用的跨平台兼容性让用户可以在不同设备上轻松同步数据。

The ___mobility of this app enables users to sync data easily across different devices.