down-feed screw

例句：

1. 1.The machine needs to be adjusted to ensure it runs smoothly.
   这台机器需要调整，以确保它运行顺畅。
2. 2. The new design uses a down-feed screw to improve efficiency.
   新设计使用下进式螺旋螺钉来提高效率。
3. 3. Down-feed screws are commonly used in industrial machinery to secure parts together.
   下进式螺旋螺钉常用于工业机械中，用于固定零件。