现在，人们默认灵长类动物和其他一些哺乳动物独自站在认知进化等级的顶端。
Now, it's been assumed that primates and some other mammals stood alone at the top of the hierarchy of cognitive evolution.
艾达是将猩猩、猴子以及我们人类和其他哺乳动物、乃至最终整个动物王国联系起来的重要环节。
Ida is a link between the apes, monkeys and us with the rest of the mammals and ultimately the whole animal kingdom.
H5N1在鸟类和其他动物之间来回传播获得突变而变得更容易感染哺乳动物也是可能的。
It is also possible that H5N1 has already passed back and forth between birds and other animals, picking up mutations and becoming better at infecting mammals.
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