虽然有些人把这些名称交替使用，鼠海豚科实际上是一个更大的群体，其中还包括像虎鲸和白鲸等动物。
Although some people use these names interchangeably, porpoises are actually a larger group that also includes animals like the orca and the beluga whale.
对这些群体的其它名称包括拿撒勒和埃尔卡赛特斯。
Other names for these groups include Nazarenes and Elkasites.
一个民族或社会群体用于称呼另一民族或社会群体的名称，该社会群体因此而得名，但本身并不这么称呼自己。
A name by which one people or social group refers to another and by which the group so named does not refer to itself.
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