drag type bit

例句：

1. 1.The car's engine is a complex piece of machinery that requires regular maintenance.
   汽车的发动机是一个复杂的机械部件，需要定期维护。
2. 2.The engineer carefully inspected the drag type bit before installing it in the machine.
   工程师在安装机器之前仔细检查了拖曳式零件。
3. 3. The new design uses a drag type bit to improve efficiency and reduce wear.
   新设计使用了拖曳式零件来提高效率并减少磨损。