extension net外延网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 limited liability有限责任扩张extension orogen of Jura style侏罗山式伸展造山带extension of limitation period[经] 时效期的延长extension of length of service延长服役年限Extension of Historic BuildingExtension of Stay for Visitors访港旅客延长逗留期限extension tube for angiography心血管造影用造影剂注射接管Extensions of the Noun Phrases名词短语的扩展Extension of the joint venture延长合资经营期限Extension Social Visit Pass Fee社交准证延期费