alligator指的是短吻鱷澄暮，主要生活在美國(guó)東南部以及中國(guó)名段，嘴巴比crocodile寬一些，短一些泣懊。參見劍橋字典的解釋：
a large reptile with a hard skin that lives in and near rivers and lakes in hot, wet parts of the world. It is like an alligator, but it usually has a longer and narrower nose
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