guard

vt.

1. 保衛；守衛；警衛[（+against/from）]
   A helmet guards your head against/from injuries.

   頭盔可以保護你的頭部免受傷害。

   A dog guarded his house.

   一隻狗守衛著他的房子。

2. 看守；監視
3. 控制；使（言詞等）謹慎
   You must guard your tongue carefully.

   你說話必須小心謹慎。

vi.

1. 防範；警惕[（+against）]
   You should wash your hands before eating, to guard against disease.

   你飯前應洗手，以防生病。

2. 守衛；看守