sperm whale的复数形式怎么写

The length of a sperm whale's tooth is 20 cm.长度的一抹香鲸的牙齿是20厘米.From the body, the sperm whale is smaller than the killer whale.从体形上看, 抹香鲸比虎鲸要小.The sperm whale has about thirty teeth in its lower jaw.在抹香鲸的下颚上大约有30颗牙齿....

sperm whale的音标：sperm whale的英式发音音标为：[spɜ:m hweil]sperm whale的美式发音音标为：[spəm hwel]...

n.抹香鲸...