microorganism|microorganisms

显微镜下可以看到许多微小的微生物。

Under the microscope, you can see many tiny ___microorganisms.

我们用显微镜观察了土壤中的微生物。

We observed ___microorganisms in the soil under a microscope.

在显微镜下可以看到许多微小的微生物。

Many ___microorganisms can be seen under a microscope.