英语语法分析

On average, bacterias are about 1 micrometre long.

细菌的平均长度大约1微米。 。

Micron: Alternative term for Micrometre. A unit to denote the caliper of paper and board.

微米：英文是百万分之一米的另一写法。表示纸或纸板厚度的单位。

Previously, standard optical microscopes managed 20 times that with a clear viewing range of just one micrometre.

以前，标准的20倍光学显微镜，只能清晰观察到一微米范围。