例句與造句

1. After a four-step drilling sequence produces a hole all the way through the blank, a reamer was passed through this hole in the final position.
2. The oversize slug blank was then loaded into a magazine loader on a 1 ] ! " Acme and thence through a four-step drilling operation making a hole halfway through the blank.
3. It's difficult to find step drilling in a sentence. 用step drilling造句挺難的