Though some bacteria Can cause food poisoning and infectious diseases in humans, most are harmless and many are beneficial.
虽然一些细菌会引起食物中毒或传染疾病给人类，但大多数细菌对人类无害，而其中有许多反而有益。
Though some bacteria Can cause food poisoning and infectious diseases in humans, most are harmless and many are beneficial.
虽然一些细菌会引起食物中毒或传染疾病给人类，但大多数细菌对人类无害，而其中有许多反而有益。
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