tubing · pipeline · (fig.) channel · means

guǎn dào

g+uǎn·3rd toned+ào·4th tone

Examples2 available

It wasn't water flowing through the pipes, but human blood.

管道里流的不是水，是人血。

Rats also have a function. They help to clean the pipes.

鼠類也有用处。它们能帮着清潔管道。