speciatingBNC²³⁶²¹³⁺¹ 基本例句 vi.物种形成原型speciate的现在分词 In his view, the hosts on which lice were speciating during the Cretaceous could have been a different branch of the mammalian family tree, all of whose species are extinct. 在他看来，在白垩纪虱子物种进化时的宿主可能是哺乳动物系统树上的另一分支而这一分支上的所有物种都灭绝了。 yeeyan