tubes
A tube is a long hollow object that is usually round, like a pipe.
He is fed by a tube that enters his nose.
他通过一根插入鼻腔的管子进食。
A tube of something such as paste is a long, thin container which you squeeze in order to force the paste out.
I went out today and bought a tube of toothpaste.
我今天出去买了一管牙膏。
Some long, thin, hollow parts in your body are referred to as tubes.
The lungs are in fact constructed of thousands of tiny tubes.
肺其实是由数千个细小管状器官构成的。
The tube is the underground railway system in London.