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a thief in the family is hard to detect
内部的坏人难以防范。A thief in the family is difficult to detect. A thief from within is hard to guard against.
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。