adjustable bellows造句

Extending the distance between the lens and the film or sensor, by inserting either extension tubes or a continuously adjustable bellows, is another equipment option for macro photography.
A thin tube of plastic ( such as polypropylene and polystyrene ) or other material, straight or with an angle-adjustable bellows segment, it is used by being held with one end in the mouth and another end in the drink.
It's difficult to find adjustable bellows in a sentence. 用adjustable bellows造句挺难的