某些动物源性细菌性疾病 Certain zoonotic bacterial diseases
眼泪不仅能使你的眼睛保持湿润，它们还含有一种物质，可以杀死某些细菌，使它们不会感染你的眼睛。
Not only do tears keep your eyes lubricated, but they also contain a substance that kills certain bacteria so they can't infect your eyes.
在老鼠的实验中他们发现土壤中的某些细菌会刺激神经产生血清素，这可以影响情绪。
An experiment on mice showed that certain bacteria normally found in soil stimulated neurons in the brain that produce serotonin, which influences mood.
数十亿年以来，某些细菌和真菌通过产生化学物质来保护自己，抵御来自其它微生物的攻击。
For billions of years, certain bacteria and fungi have produced chemical substances to protect them from attack from other microorganisms.
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