例句與造句

1. A single welded butt joint is the name for a joint that has only been welded from one side.
2. There are many types of butt welds, but all fall within one of these categories : single welded butt joints, double welded butt joint, and open or closed butt joints.
3. It's difficult to find single welded butt in a sentence. 用single welded butt造句挺難的