A micro-organism is a very small living thing which you can only see if you use a microscope.
英漢詞典釋義
n.
微生物
The diseased tissue can be easily invaded by these microorganisms.有病的組織容易被微生物侵襲。They act at least a temporary block to DNA synthesis in microorganisms.它們在微生物中至少對DNA合成起暫時性的阻止作用。