hopper boy造句

例句与造句

1. In response, Evans developed the " hopper boy ", a device which gathered meal from a bucket elevator and spread it evenly over the drying floor a mechanical rake would revolve around the floorspace.
2. In 1787, American inventor Oliver Evans revolutionized this labor-intensive process by building the first fully automatic mill using bucket elevators, screw conveyors, and the hopper boy to spread, cool, and dry the meal between grinding and bolting.
3. It's difficult to find hopper boy in a sentence. 用hopper boy造句挺难的