他继续按照他的分类学，把鲸按大小分为三大类或三本书。
Continuing in his taxonomy, he groups whales into three major categories, or books, by size.
在一本期刊《当代生物学》发表的研究上指出，这首座头鲸唱的曲子在全世界通用，在任何海域都能听得到。
But a study, published in the journal Current Biology, shows that this song changes over time and spreads around the oceans.
综述了近年来鲸类分子系统学的研究进展。
The progress of the study on molecular phylogeny of cetaceans was reviewed.
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