But becoming small wouldn't work in every part of the planet. 但变小并不适用于地球的每一个地方

250. giant dinosaurs may have no longer roamed the forest,
     巨大的恐龙也许不再主宰森林
251. but their tiny cousins had recolonized them
     但它们的小表弟以一种全新的方式
252. in a completely new way.
     重新占领了森林
253. But becoming small wouldn't work in every part of the planet.
     但变小并不适用于地球的每一个地方
254. The death of the dinosaurs
     恐龙的灭绝
255. had left many of Earth's great habitats free for the taking.
     使地球上许多重要的栖息地 变得唾手可得
256. None more so than the plains.
     平原尤其如此

来自《我们星球上的生命 第一季 第六集 Life on Our Planet S01E06 灰烬中重生》第 253 行