micron mill

例句：

1. 1.The micron-sized particle is too small to be seen with the naked eye.
   这个微米大小的粒子太小，肉眼无法看见。
2. 2.The micron-thick layer of paint on the wall is peeling off.
   墙上那层微米厚的油漆正在剥落。
3. 3.The micron-scale measurement of the material's density is crucial for its strength.
   这种材料的密度的微纳米级测量对于其强度至关重要。