It actually turns out, though, even though we've only known of long-range propagation for a few decades, the whales clearly have evolved, over tens of millions of years, a way to exploit this amazing property of the ocean.
而实际上，尽管， 虽然我们近几十年来才对这种远距离传播有所了解， 而鲸显然在数千万年之前就已经 进行了进化， 进化出了一种方法来运用海洋的这一令人惊奇的特性。