...近摄接圈（extension tube）就是有卡口有触点的金属镜筒，没有任何镜片，作用就是把镜头和机身之间的距离加大，这样可以缩小镜头最近对焦距离，当然这样就可...
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Kenko extension tube 肯高近摄接圈
automatic extension tube 自动延长管
Three-way Extension Tube 医用延长管三通阀
pear-shaped extension tube 梨状延伸管
Kenko extension tube set DG 肯高电子自动近摄接圈
Automatic Kenko extension tube set 公司出品的自动近摄接圈组
Extension-tube 延长管
way Extension Tube 医用延长管三通阀
以上来源于: WordNet
N 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 近摄接圈 [photog]
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。
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 balance extension tube functions to retain balanced pressure in front and at the back of the cleaner prior to the opening of the valve to prevent it from impacting the valve core.
发球筒平衡接管的作用是在通球初始时，出球接口端的阀门未开启前使清管器在发球筒中处于前后压力平衡，不能撞向阀芯。
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