a mouth guard的用法和样例：
- The gut is complete, with a mouth and anus.
- Carve a nose and a mouth and scoop out eyes.
- Then add eyes, a mouth, antennae and feet.
- He took a mouthful of sweet country air.
- Ever wondered how a mouth could hold so many fry?
- What has a mouth and a fork but never eats?
a mouth guard的相关资料：
ajacol a A house of weathered shingles. A Manual Controller for Inverter a mechanism of balancing benefit a distinctive style or manner. A great disaster is befalling. A huge chasm gapedbefore them. A generation drenched in hate. a parasitic disease/infection A Study of Criminal Adjudication a gathering of religious leaders