micrometer rods

例句：

1. 1. Themicrometer rods are used to measurethe length of objects.
   微米棒用于测量物体的长度。
2. 2. The micrometer rodswere used to measure the dimensions of thenew building.
   微米棒被用来测量新建筑的尺寸。
3. 3. The micrometer rods were used to measure the thickness ofthe material.
   微米棒被用来测量材料的厚度。