Doctors place a long thin tube called a catheter into the heart.

VOA: special.2010.03.02

We have come a long way from the gas discharge tube to the heavens.

我们在从气体放电管到,世界还有很长的路要走。

麻省理工公开课 - 固态化学导论课程节选

Conventional colonoscopy is performed with a long, flexible tube called a colonoscope that is equipped with a tiny fiber-optic video camera and light at the end.

VOA: standard.2010.04.07