单词：clam up
拒不开口
clam up的用法和样例：
例句
- He always clam up when we ask him about his family.我们一问到他的家庭时，他总是闭口不言。
词汇搭配
- clam up拒不开口
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VOA标准英语2011年(六月)
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美国习惯用语
美国习惯用语
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趣味英语
趣味英语