题目内容
n. a join made by tying together two places or ends of string, rope, etc.. ;
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n. a list of names or topics that are referred to in a book, etc., usually arranged at the end of a book in alphabetical order or listed in a separate file or book
n. an arm or a leg; a similar part of an animal, such as a wing
adj. having a close and friendly relationship;
n. a shape like a curve or circle made by a line curving right round and crossing itself
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