1 [C] a long empty pipe 管子: Blood flowed along the tube into the bottle. 血液沿着管子流到瓶子里。the inner tube of a bicycle tyre 自行车轮胎的内胎 ☞Look at test tube. 参看test tube。

2 [C] a tube (of sth) a long thin container made of soft plastic or metal with a lid at one end. Tubes are used for holding thick liquids that can be squeezed out of them. （塑料或金属制的）软管: a tube of toothpaste 一管牙膏 ☞picture at container 见container插图

3 the tube [sing] (Brit 英) (informal 非正式)=UNDERGROUND³