to act as
01
充当, 作为
to perform the role or function of something
例子
This tool acts as a substitute for the original equipment in an emergency.
这个工具在紧急情况下充当原始设备的替代品。
The symbol on the map acts as a guide for travelers.
地图上的符号充当旅行者的指南。
02
假装, 装作
pretend to have certain qualities or state of mind
