拉杆天线，套筒式天线

请伸展伸缩式天线并调整角度以改善接收效果。

竖直地伸张伸缩式天线。

longitudinal guide, telescopic guide

telescopic pipe

telescopic compensating member

telescopic

telescopic cylinder

TELESCOPIC shores or struts in building

telescopic rod

telescopic cylinder, oil-pressure brake-release cylinder