So what..

英語
So what happens is that in a way you have a much bigger lung, but it branches and branches down to distances about the same for a whale, for a man and for a little rodent.
日本語
何が起こるかと言うと、人や齧歯動物の肺がクジラ一頭ほどの大きさに枝分かれしながら拡張します。