1. They are grinding wheat into flour. 他们正在把小麦磨成面粉。
2. Grinding is the most efficient way to obtain accuracy and fine finish. 磨削是获得精确度和良好光洁度的最有效的方法。
3. In the process of bearing grinding, the accuracy of bearing parts were first assured. 在轴承的磨削加工过程中，首先要保证的是零件的加工精度。
英英解释
n.
1. matter resulting from the process of grinding
2. a harsh and strident sound (as of the grinding of gears)
3. the wearing down of rock particles by friction due to water or wind or ice
