around 80% have been islanders. 大约百分之八十是岛屿物种

263. Isolated communities may evolve for millions of years in relative peace,
     与世隔绝的动物群落 可能在数百万年内演化出了相对稳定的生态
264. But, when new challenges arrive, they can struggle to cope.
     但当新挑战来袭 它们只能尽力去应对
265. Of all the species that have become extinct in recent years,
     近年来濒于灭绝的物种之中
266. around 80% have been islanders.
     大约百分之八十是岛屿物种
267. Our impact on the Earth is greater today than ever before.
     人类对地球所造成的影响 比以往任何时候都要深远
268. Yet some islands are so remote
     然而有些岛屿是如此偏远
269. that few humans have even set foot on them.
     以至于几乎没有人类踏足

来自《行星地球 第二季 第一集 Planet Earth S02E01 岛屿》第 266 行