reinforcement

n. 加强法(加强件)

The soldiers held the fort desperately till reinforcement arrived.

战士们拼死坚守阵地，直到援军到来。

An athletic supporter having a protective reinforcement of rigid plastic or metal.

运动员护身一种运动员用的护身弹性织物，有用保护性的坚硬塑料或金属制成的加强层