健康的肺部会产生一种天然的抗生素，通过杀死呼吸道表面的有害细菌来保护肺部不受感染。
Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces.
怎样保护自己不受感染？
在啮齿动物中，LL - 37一类的蛋白保护大脑不受感染。
In rodents, the protein that corresponds to LL-37 protects against brain infections.
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