Dolphinsliveinadarkunderwaterworld.It’softenimpossiblet...
問題詳情:Dolphinsliveinadarkunderwaterworld.It’softenimpossibletoseeeachotheroranythingelsearoundthem,sosoundplaysanimportantroleintheirsurvival.Tocommunicatewitheachother,dolphinsproduceallkindsofsou...