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n.伸展，扩大；延长，延期；[医]牵引；电话分机 变形： 复数：extensions 双语释义：n.(名词)[U]延伸,扩展 (an example of) the act of extending or being extended[C]增加部分 a part which is added to make sth longer, wider, or larger[C]电话分机 any of many telephone lines which connect various rooms or offic
