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 characters特征标的扩张extensional oscillation纵向振荡extensions and footings[经] 小计和合计extension of connection联络的扩张extensional attenuation伸展减薄Extension of Enlistment延长服役期extension of breakwater导堤延伸extension trunk dialing分机中继线拨号extension of a function函数的开拓extension of knee joint伸膝