And you never worry about anything. 而你从不为任何事忧虑
..or warn each other about the arrival of predators. 也许是警告同胞捕食者的出现
So one of the dolphins actually went about 46km upstream 一只河豚从放生处逆流而上46公里之远
And we only have about 2,000 of them left in the Indus River. 印度河中只剩下约2000只了
so, actually, when you really think about it, 所以如果仔细想一想