例句與造句

1. Each seaming head typically consists of two rolls, a first operation roll and second operation roll, and a chuck.
2. Initially, the first operation roll folds the lid ( end ) and then the second operation rolls tightens the resulting seam.
3. After the first operation is complete, the first operation roll disengages from the can and the second operation roll then engages the can.
4. Some seaming machines have two first operation rolls and two second operation rolls and a few machines use a method called " rail seaming " which requires no rolls.
5. The shape of the seam is determined by the shape of the first operation roll, the second operation roll, their relative positions and distances, lifter height, lifter pressure.
6. It's difficult to find second operation roll in a sentence. 用second operation roll造句挺難的