And essentially, the story is this with right whales, that about a million years ago, there was one species of right whale on the planet, but as land masses moved around and oceans became isolated, the species sort of separated, and today we have essentially two distinct stocks.
而且基本上，关于露脊鯨的报道是这样的， 大约一百万年前，在这个 星球上有一种露脊鯨， 但当大陆板块移动，海洋被分割， 这个物种被分隔开了， 因此如今，本质上说有两个截然不同的种群。