Malaria is caused by a microscopic blood parasite that is transmitted in the bite of female mosquitoes, which need a blood meal to produce their eggs.
疟疾是被雌性蚊子叮咬时传播的一滴微观的血液引起的。蚊子们需要喝足了血来产卵。
It was caused by a harmful algae bloom, a so-called red tide of microscopic organisms that spread from time to time.
那次鱼死亡是由一种有害的绿藻引起的，一种所谓的微观生物繁殖造成的赤潮。
Animal experiments and electron microscopic studies have indicated that this infectious disease may be caused by several different viruses (exclusive of EB virus and cytomegaloviruses).
动物实验及电镜研究表明，此种传染病可由数种病毒引起（除外EB病毒和巨细胞病毒）。
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