英文：A bacterium is identified as the cause for his duodenal ulcer.
中文：一种细菌被断定为造成他十二指肠溃疡的根源。
英文：An organism, such as a bacterium, requiring oxygen to live.
中文：好氧菌需要氧气生存的有机体, 例如细菌
英文：A protein substance produced in the blood or tissues in response to a specific antigen, such as a bacterium or a toxin. Antibodies destroy or weaken bacteria and neutralize organic poisons, thus forming the basis of immunity.
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