分类学家对动植物的分类工作进行了250多年，但是，他们仍然不能准确地回答“地球上的生物有多少种？”这一问题。

Though taxonomists have been cataloguing plants and animals for more than 250 years, they still have no exact answer to the question, "How many species are on Earth?"

youdao

分类学家对动植物的分类工作进行了250多年，但是，他们仍然不能准确地回答“地球上的生物有多少种？”这一问题。

Though taxonomists have been cataloguing plants and animals for more than 250 years, they still have no exact answer to the question, "How many species are on Earth?"

youdao