Tropical fish: Including characin, cyprinidae, medaka, cichlid, gourami, biota or loach and groupers and so on.
包括、、鱼、、攀鲈、鳅、鲶等.
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We aren't sure why more animals haven't been able to put these microbes to work for them; perhaps it's because their guts don't have the right chemical composition or because other biota already living there are hostile towards newcomers.
我们不确定为什么更多的动物不能让些微生物为它们工作;也许是因为他们的内脏没有正确的化学成分, 或者因为已经生活在那里的其他生物群对新来者充满敌。