" And if they're moving they could be moving these ecological services across the continent on an annual basis."

“如果它们移动，那么可能每年它们都跨越美洲运送这种生态服务。”

If they're moving they could be moving these ecological services across the continent on an annual basis.

克莱姆：如果他们在移动，他们可能会每年在整个大陆移动这些生态服务。