微生物寄居肠道占有丰富的食物，增强消化系统并特别防御病原体侵入从而改善人类健康。
Microbes colonize the gut to gain access to a rich food source, and in return they are known to improve human health by enhancing our digestive system and providing extra defenses against pathogens.
甲壳动物酚氧化酶在入侵微生物的刺激下被激活，参与机体的防御反应，因此与机体的免疫状态有一定的相关。
The phenoloxidase in crustacean is activated by the invading microbes, and is involved in the defense reaction, thus having certain relation with the immune condition of the animals.
根据研究，鳄鱼可以在接触到如细菌和病毒这样的病微生物而导致防御机制启动前，自动地对抗这些微生物。
According to the researchers, alligators can automatically fight germs such as bacteria and viruses without having been exposed to them before launching a defense.
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