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This indicates it is not fully adapted to its new host species, the human.

表明它不完全适应新的宿主种类——人类。

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Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.

把很多但下到宿主的蛋上面的方法，黄蜂从这经验中学习下蛋法。

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So, in the clamour to conserve a host of iconic species, is there a case for us to be more realistic about our ability to intervene?

BBC: Why such a fuss about extinction?

Scientists are working to figure out which species could now be playing host to the virus, and one possibility is pigs.

NPR: Bird Flu 101: How Bad Is The New H7N9 Strain?

We now know that the hot-springs that sustain these "vent" ecosystems occur in every ocean basin and are host to hundreds of previously unknown animal species.

CNN: Probing the ocean's undiscovered depths