drop type sprag

例句：

1. 1. The drop type sprag is designed to fit perfectly into the hole in the wall.
   漏斗型弹簧设计得可以完美地安装在墙上的孔里。
2. 2.The engineer used a drop type sprag to adjust the tension of the spring.
   工程师使用漏斗型弹簧来调整弹簧的张力。
3. 3. The drop type sprag was responsible for holding the door open until it was closed.
   漏斗型弹簧负责保持门打开直到它关闭。