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但“Put my foot in my mouth”可不是“要把脚放进嘴里”！1put one's foot in one's mouth
put one's foot in one's mouth是一个地道英语俚语“先来看看英文词典的解释：
to say something by accident that embarrasses or upsets someone
例： Do you remember what you said last weekend? You really put your foot in your mouth.你还记得上周末你说的话吗？你真的说错话了。例：The restaurant established its reputation by word of mouth. 餐馆因为良好的口碑而享有盛誉。
be down in the mouth = to be sad例：He was down in the mouth after being defeated in the game.输了比赛后，他垂头丧气。“三个人”到底是three people还是three persons？