They must get to the sea as soon as possible 它们必须尽快爬向大海

256. are beginning to hatch.
     开始孵化了
257. Most hatchings happen at night.
     多数的蛋是在夜间孵化
258. Now, in the light of day, the young are extremely vulnerable.
     现在是白天,小海龟们很容易受到攻击
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

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 259 行