正常人的消化系统有大量的细菌寄生，如大肠杆菌，变形杆菌，克雷氏菌及隐球菌等。
There are a great number of bacteria parasitizing in the digestive system of normal people like Escherichia coli, proteus, Klebsiella pneumoniae and Cryptococcus.
人们已经证实细菌确实寄生在机舱舱面上，所以你应该注意经常洗手。
Bacteria have been shown to live on cabin surfaces, so wash your hands frequently.
立克次氏体是一种细菌，这种细菌可引起多种疾病，并通过吸血节肢寄生动物传播。
Rickettsia is a bacterium which can cause many diseases that are transmitted by blood-sucking parasitic arthropods.
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