millimeter

例句：

1. 1. The distance between the stars is about 250 million miles.
   星星之间的距离大约是2.5亿英里。
2. 2.The thickness of the material can be measured in millimeters.
   这种材料的厚度可以以毫米为单位测量。
3. 3. She carefully measured the length of the rope with a millimeter ruler.
   她用毫米尺仔细测量了绳子的长度。