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1·He was down in the mouth because he missed his train.

他因为没赶上火车而闷闷不乐。

2·Im a bit down in the mouth today.

我今天有点闷闷不乐的。

3·I'm a bit down in the mouth today.

今天我胃口不是很好。

4·Because he looks down in the mouth.

因为他总是往嘴里看。

5·You look down in the mouth. What's the matter?

你看起来很沮丧，出什么事了？

6·Since her dog died, Susan has been down in the mouth.

苏珊的狗死了后，她一直愁眉苦脸的，闷闷不乐的。

7·Talk about getting down in the mouth - that was me all over.

也就是嘴上这样说说——这就是我。

8·If this should happen, the speaker might feel down in the mouth.

如果发生这种情况，这个发言者可能会感到沮丧。

9·Remnants of foods will break down in the mouth releasing the sugars and acids that cause damage and discoloration to teeth.

牙齿上的残留物在口腔内会分解为糖和酸，腐蚀牙齿，形成牙渍。

10·If this should happen, the speaker might feel down in the mouth. In other words, he might feel sad for saying the wrong thing.

这种情况发生时，说话的人会觉得心情沮丧，换句话说，他会因为说错话而心情不好。