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 hand tap手用长柄丝锥extension projects扩建项目extension fixation固定extension of route运输契约规定外的运程extension judgment可拓评价extensional method可拓方法extension at break断裂伸长extension sequence张拉顺序extension function分机功能Extensional regime伸展作用