And crucially, like polio, smallpox had only one animal host: Homo sapiens.

人类。

And these use light to generate energy, and that energy is then transferred to the coral animal host.

这些藻类用光产生能量，之后能量被转移到珊瑚虫宿主身上。

That mission will help people better understand animal hosts for COVID-19 and ascertain how the disease jumped between animals and humans.

本次任务的目的是增进对新冠肺炎宿主的了解，并确定该疾病如何在人和动物之间传播。

So this is just the first step, where we created the animal host, but we're now continuing to further replicate this animal-algal symbiosis.

因此这只是我们创造动物宿主的第一步，但我们会继续进一步复制这种动物-藻类共生关系。

So this is just the first step where we created the animal host, but we're not continuing to further replicate this animal-algal symbiosis.

所以这只是我们创造动物宿主的第一步，但我们不会继续进一步复制这种动物-藻类共生关系。