killer whale的复数形式怎么写？

n.逆戟鲸，虎鲸...

It has 10 more teeth than a killer whale.它比虎鲸多10颗牙齿.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.A minute later, in full view, a killer whale ate them both.一分钟后, 众目睽睽之下, 一只虎鲸将它们统统吃掉....

killer whale的音标：killer whale的英式发音音标为：['kɪlə hweil]killer whale的美式发音音标为：['kɪlɚ hwel]...