在美国大陆，到处都有海狸，大约有2亿只海狸。

There used to be beavers all over the place, something like 200 million beavers, just in the continental United States.

youdao

据报道，这个“特大城市”由3.6亿只工蚁和100万名蚁后组成，他们居住在4500个相互连接的巢穴中，这些巢穴分布在2.7平方公里的土地上。

This 'megalopolis' was reported to be composed of 360 million workers and a million queens living in 4,500 interconnected nests across a territory of 2.7 square kilometres.

youdao

总共有两亿只禽鸟已经死亡或被销毁。

Overall, more than 200 million birds have either died or been destroyed.

youdao