延长线；[通信]分机线；引出线

延长线，分线机，分机线

extension ring───伸长环；近摄接圈

extension light───延长灯

extension rings───伸长环；近摄接圈

attention line───注意线；指定收信人；警示线

extension lead───伸长引线

extension tube───n.伸缩管

extensionalism───扩张主义

extensionality───n.[数]外延性

extension ladder───n.伸缩梯；拉梯

After the subroutine parameter is given the origin number, the plotter controlled by computer can draw out automatically extension line, dimension line, arrowhead and write dimension figures.───当给子程序的参数赋以初值后，由计算机控制自动绘图机绘制出尺寸界线、尺寸线、箭头和注写尺寸数字。

The extension line type intersection is a special intersection for highways in mountainous areas.───展线型立交是山区道路中的特种立交。

We are at the north and south extension line of the Beihai Park.───我们的位置在北海公园的南北延长线上.

An extension line with a certain distance to the steel bar discharge hole is provided with a contact travel switch. A wire is connected between the travel switch and a clutch electromagnet.───距离钢筋出料口一定距离的延长线上设有一个接触式行程开关，行程开关与离合器电磁铁之间连接有导线。

After the subroutine parameter is given the origin number, the plotter controlled by computer can draw out automatically extension line, dimension line, arrowhead and write dimension figures.