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The bulk container can fix the extension tube well while not affecting the normal work of the liquid tapping valve. 本发明既能良好的固定延伸管，同时也不妨碍放液阀的正常工作。 ip.com
Removing the extension tube shortens the spacing to allow any binocular viewer to reach focus without a Barlow lens. 除去延长管缩短 间隔让任何的用两眼的观众到达没有一个巴罗镜的焦点。
The Extension consists of a length of steel tube with a coupling on one end to attach to the valve, and a coupling on the other end to attach to a handwheel or some other type of operating device. 阀杆加长件由带连接在阀门上的联轴节的钢管长度，连接在手轮上的联轴节，或其它类型的操作机构组成。
权威例句
Instrument makers of the time also invented a trumpet with a sliding, telescoping tube extension. NPR: Young Tuba Player Gets Nod from Phila. Orchestra
a spacer element that can be fixed between the camera body and the lens to increase the distance between film and lens and allow closer focus than would be possible without it