疟疾是由称为疟原虫的一种单细胞寄生虫造成的。
Malaria is caused by a one-celled parasite called a Plasmodium.
这种寄生虫在人体的肝脏中繁殖，然后感染血红细胞。
In the human body, the parasites multiply in the liver, and then infect red blood cells.
与细菌不同，病毒包括没有复制所需的所有机制，因此它们要像寄生虫一样向其它细胞借产品。
Unlike bacteria, viruses don't contain all the machinery necessary to replicate, and so like parasites they borrow the goods from other cells.
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