比喻用法。

1. A thorough brushing helps to freshen up your mouth.

彻底刷牙有助于口气清新。

2. His mouth was a little open, as if he'd started to scream.

他的嘴微微张开,似乎是要开始尖叫.

3. I've always had a loud mouth, I refuse to be silenced.

我一贯大声说出自己的想法，不会迫于压力而一言不发。

4. You wouldn't be here now if she'd kept her mouth shut.

如果她守口如瓶的话，你现在就不会在这儿啦。

5. She flicked a crumb off the corner of her mouth.

她擦掉嘴角的面包屑。