Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces.

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。

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It contains bioflavonoids, one of which is a natural antibiotic.

它含有类黄酮，其中之一，是一种天然抗生素。

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Propolis is a natural antibiotic with strong antimicrobial properties.

蜂胶是一种天然抗生素的抗菌性能强。

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So,Once they are lost in response to a toxic sound or to an antibiotic it cannot be regenerated by natural means.

一旦因噪音或抗生素遭受损失,就难以再生。

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The only explanation she can offer is that there is indeed a low natural level of antibiotic resistance in the bears' bugs, a point that the team wants to look into next.

ECONOMIST: Are the bugs in wild animals resistant to antibiotics?

In May Merck published details of a new antibiotic gleaned from a soil sample from South Africa after screening 250, 000 natural extracts.

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The discovery that animals in pristine environments have few bacteria with resistance genes makes it likely that much of the antibiotic resistance found in these other species is a result of human influence, rather than natural gene-circulation.

ECONOMIST: Are the bugs in wild animals resistant to antibiotics?