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extensional deformation延伸变形extension printed board外接印刷板extensional abstraction外延抽象extensional metallogeny伸展成矿extension of fetal head胎头仰伸extension telephone set电话分机extension of base field基域的扩张extension group hunting分机群寻线extension transformation可拓变换extension polarized bell极化分铃