we still have no idea. 仍然是个谜

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
266. How they find their way back across thousands of miles of open ocean,
     它们如何从1000英里外再次赶回
267. we still have no idea.
     仍然是个谜
268. A frigate soars.
     军舰鸟正在高飞
269. Somewhere, beneath the surface below, there is the food it must have.
     水下某个地方一定有食物
270. But where?
     可在哪里呢?

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 267 行