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visibly sad or depressed
明显的悲伤或沮丧
Molly's been moping around all week, and I have no idea why she's so down in the mouth.
莫莉整个星期都闷闷不乐的，我不知道她为什么这么沮丧
Rob has been down in the mouth ever since Gloria broke up with him.
自从格洛里亚和罗布分手后，罗布一直垂头丧气的。
The bad news left her feeling really down in the mouth.
这个坏消息让她的情绪十分低落。