Black coffee leaves a bitter taste in the mouth.

清咖啡在嘴里留下苦味。

《牛津词典》

Poor digestion can be caused by defective mastication of the food in the mouth.

消化不良可能是因为嘴里的食物没有完全嚼碎而引起的。

《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。

youdao

People chew it to cleanse the tastebuds in the mouth and support fresh breath.

VOA: special.2011.03.16

It's a very powerful argument that, in a way, Socrates makes against himself, putting that speech in the mouth of the laws.

这是很有力的申论，在某种程度上，苏格拉底自我违抗，转而以法律的立场说话。

耶鲁公开课 - 政治哲学导论课程节选

Well, when Pavlov, for instance, started before conditioning there was simply an unconditioned stimulus, the food in the mouth, and an unconditioned response, saliva.

比如，在条件作用形成之前,只是简单的存在着无条件刺激，即食物，以及无条件反应，即唾液。

耶鲁公开课 - 心理学导论课程节选

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

Apparently, the drug can be absorbed both through the tissues in the mouth, and of course, digestion.

FORBES: As Caffeinated Gum Hits The Shelves, FDA Jumps To Attention

In Texas, we actually know it is a good idea to look a gift horse in the mouth.

NPR: Texas Gov. Under Fire For Rejecting Stimulus Funds