慢速英语:研究人员认为他们发现了新种类的鲸鱼

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previously – adv. happening before the present time

species – n. biology : a group of animals or plants that are similar and can produce young animals or plants

beaked – adj. (of an animal) having a hard usually pointed part covering the mouth

pop – v. to come from, into, or out of a place suddenly or briefly

marine – adj. of or relating to the sea or the plants and animals that live in the sea