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Dolphinsliveinadarkunderwaterworld.It’softenimpossiblet...
问题详情:Dolphinsliveinadarkunderwaterworld.It’softenimpossibletoseeeachotheroranythingelsearoundthem,sosoundplaysanimportantroleintheirsurvival.Tocommunicatewitheachother,dolphinsproduceallkindsofsou...