1·They are cobalt-blue on top and silvery-white below, with a pronounced dorsal fin and a long, lethal, spear-shaped upper jaw.
它的顶部是钴蓝色，下面和银白色；有着明显的背鳍，还有着长长的、能致命的矛状上颚。
2·The first dorsal fin is black at the front.
第一个（刺背鳍是在前面的黑。
3·We know this because we can distinguish the male by their large dorsal fin .
我们能知道是因为可由大背鳍区别为雄性。
4·Its dorsal fin was in front of me. I was screaming for help.
它的背鳍就在我的前面，我尖声呼救。
5·Any of several whales of the family Balaenidae, characterized by a large head, whalebone plates in the mouth, and absence of a dorsal fin.
露脊鲸：露脊鲸科中的几种鲸，特征为头部硕大、嘴边长有鲸须而无背鳍。