extensionaladj.外延的；延伸的；客观事实的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 resource可拓资源extension coupling伸缩联轴器extension bed lathe接长床身车床Extension detecting可拓检测extension procedure扩展过程extension principle扩展原理extension - ulnar尺偏Extension Direction延伸方向extension of credit增加贷款extension of demand需求扩大