护甲的英文：
a guard

参考例句：

Nail saver
护甲液

The armadillo has a protective shell of bony plates.
犰狳有角质鳞片的护甲.

A small,light,rounded steel helmet,terminating in a point and often closed in front with a visor.
钢盔一种小的，轻的圆钢盔，顶端有尖刺，通常前面带有护甲

guard是什么意思：
n. 卫兵；护卫队；守卫；警戒；防护装置；列车长
v. 看守；监视；控制；防范

guarding position
防守位置

a guarded answer
谨慎的回答

...the Irish Guards
...爱尔兰近卫团

a security guard
安全警卫

The sentry is on guard.
那哨兵在站岗。