一张纸大约有0.1毫米厚。

A sheet of paper is about 0.1 ___millimeters thick.

这款新智能手机的厚度不到8毫米。

The new smartphone is less than 8 ___millimeters thin.

一只蚂蚁的长度可以小到只有2毫米。

An ant can be as small as 2 ___millimeters in length.