Garland covered his mouth with his hand and belched discreetly.

加兰用手捂住嘴，小心翼翼地打了个嗝。

《柯林斯英汉双解大词典》

Digestion begins in the mouth with the action of saliva.

消化是在口腔中唾液的作用下开始的。

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Brush buttocks with bumf before, how do you convert now to wipe the mouth with bumf?

以前用卫生纸擦屁股， 现在你怎么改用卫生纸擦嘴了?

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One woman covers her eyes with her hands, the other covers her ears and the third woman covers her mouth.

VOA: special.2009.03.11

The mouth is associated with pleasure.

快乐来源于口腔的动作。

耶鲁公开课 - 心理学导论课程节选

Most of the time I walk down Fifth Avenue with my mouth just watering

很多时候，我在第五大道都是边逛边馋涎欲滴，

小心超额消费 - SpeakingMax英语口语达人

Radiation treatment every day for tonsillar cancer was filling his throat and mouth with sores.

ECONOMIST: Alan Landers, ex-smoker, died on February 27th, aged 68

Now I am not advocating looking the gift horse in the mouth with respect to college aid.

FORBES: College Aid Announcements Sign of Predictable Change

Tiye filled his mouth with beer and swished it around loudly, as if he were gargling with mouthwash.

NEWYORKER: Ghosts