Pipeline refers to the components used to transport various fluids in the pipeline, and the pinyin is [Gu M N Z ǐ].

The cross section of the pipeline is usually circular, and there are also special-shaped pipelines made of non-circular cross section. Some metal pipes, such as steel pipes and copper pipes, can also be used as structural members or decorative elements. Pipes are made of many materials, such as steel, iron and copper, and nonmetals, such as ceramics, plastics and rubber. The pipe can also be made of composite materials of metal and metal or metal and nonmetal.

Pipeline example:

1, water seeped into the bathroom along the pipe.

2. Water spouted from the crack in the water pipe.

This pipe leads the waste water to the pool.

If you can't inflate, or want to inflate, just blow this tube.

The iron bar is solid and the pipe is hollow.