shield

/ʃild/

a protective covering or structure

中文释义：盾牌；保护物

The soldier raised his shield to block the incoming arrows.

士兵举起盾牌挡住飞来的箭。

A thick layer of ozone acts as a shield against harmful UV rays.

厚厚的臭氧层充当抵御有害紫外线的保护层。