mouth习语学习   mouth是英语的基本词汇，学习和使用mouth所构成的常见习语会丰富我们的写作和口语表达。 1.be all mouth 表示“只说不做”。比如：He's always boasting about his achievements, but he's really just all mouth.他总是吹嘘自己的成就，但实际上只是光说不做。 2. down in the mouth指“闷闷不乐；沮丧”。比如：You look down in the mouth. What's the matter? 你看起来很沮丧，出什么事了？He was down in the mouth because he missed his train.他因为没赶上火车而闷闷不乐。 3. keep your mouth shut“守口如瓶；保持缄默”比如：I've warned them to keep their mouths shut about this. 我警告他们对此事要守口如瓶。Now she's upset—why couldn't you keep your mouth shut? 瞧她现在心烦意乱的样子—你就不能闭上嘴？ 4. run off at the mouth表示“喋喋不休，滔滔不绝”。形容说话连绵不断，冗长而无聊。比如：He just likes to run off at the mouth. Nobody listens to all that talk.他就忽悠别人能行，你没看大家都不喜欢听他说话么。 Since this is often the opening question in an interview, be extracareful that you don't run off at the mouth.这个问题通常是一个面试的开始的第一个问题，要额外的小心不要滔滔不绝。