extension tovt.对于 ... 的延长部分(对于 ... 的扩建部分)extensionn.延长；伸展；延期；扩充；观念发展；增强n.电话分机；特别课程n.[计]文件名extension of hip joint大腿伸extensional evaluation可拓评判extension manipulation拔伸手法Extension institutions农机推广机构extension test adapter分机测试机盘extensional structures伸展构造extension of upper limb上臂伸extensional environment伸展环境extension service class电话分机业务类别extension approximation延拓逼近