海豚介绍（英文版）最好是一个作文那样的,急用!感激不尽!不要太多,50词左右

How many kinds of dolphins are there?
you for is china
This question will probably never be answered correctly. As humans, we want to put everything we know of into a group. Some people like large groups with some variation and others like small, precise groups. Not everyone agrees about what marine dolphins deserve their own species name and what ones do not. I currently have 32 species of marine dolphins listed. I am pretty sure that this covers all the species accurately. Most people agree that there are six species of porpoises and five species of river dolphinsforr dias ed