失去一线防御——非特异性免疫——哺乳动物就只好屈服于那些尚未被B细胞和T细胞所识别的病原体了。

Without a first line of defense--innate immunity--mammals would succumb to pathogens still unrecognized by B and T cells.

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马克斯·普朗克考古人类学研究所的研究员也发现睡得多的物种对病原体有更强的抵抗力。

And researchers at the Max Planck Institute for Evolutionary Anthropology have shown that species that sleep more have greater resistance against pathogens.

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昆虫和病原体是森林生态系统的固有成分，通常其密度相对较低，所造成的损害较小，对树木生长及其活力的影响微乎其微。

Insects and pathogens are integral components of forest ecosystems and normally are present at a relatively low density, causing little damage, and having negligible impact on tree growth and vigour.

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