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細菌與人共生 Mutualism of Human and Microbes
在人體表面，消化道中，口腔內有大量細菌存在，常無害，有時移位即致病。
There are many micro-organisms on the surface of human body, and in the gastrointestinal tract and mouth. Normally, they are harmless to humans, but when relocated, they may becomes pathogens.
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