During the next twenty years, 在接下来的20年时间里

259. They must get to the sea as soon as possible
     它们必须尽快爬向大海
260. but their trials have only just begun.
     不过小海龟的试炼才刚刚开始
261. Many will drown in the pounding waves.
     许多小海龟淹死在巨浪中
262. During the next twenty years,
     在接下来的20年时间里
263. the vast majority will inevitably die
     大多数的海龟将不可避免的死去
264. but those that survive will, eventually, as their mothers did before them,
     活下来的海龟最终还会做它们的母亲做过的事情
265. return to the very same beach where they were hatched.
     回到它们孵化过的海滩上繁殖

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 262 行