a length of tubing的用法和样例：
- He fished a length of string out of his pocket.
- An aerosol, natural or artificial is made to flow through a length of tubing, the aerosol particles diffuse to the walls.
- He fish a length of string out of his pocket.
- I need a length of wire or string to tie it with.
- He clipped off a length of wire.
- The anchor was attached to a length of rope.