guide tube

基本解释

Rocker arm, Rocker arm shaft, Rocker assembly, Valve guide tube, Camshaft bearing Cap.
气门摇臂，摇臂轴，摇臂总成，气门导管，凸轮轴盖。
The center hole will house the center guide tube that you can also see in the background.
中心孔会内务中心指导管，您也可以看到，在背景中。
When researchers want to examine the cells and their interactions at this site, they insert a tiny optical instrument called a microendoscope inside the glass guide tube.
当研究者想要研究某个部位的细胞以及细胞之间的相互作用时，就可以将一个微小的光学仪器，即显微内镜，插入到那个玻璃导管里。

Unfortunately, that still provides no clear guide to how a clash between central government and the mayor over the future of the tube would be resolved.
ECONOMIST: The Greater London Authority
They ended up producing a flexible catheter tube that goes a bit of the way up the nostrils, then a guide wire is inserted into the targeted sinus. (In live patients this is done via an endoscope and fluoroscope.) A balloon catheter is advanced over the guide wire and positioned against the blocked ostium.
FORBES: Balloon Therapy