alligator指的是短吻鳄，主要生活在美国东南部以及中国，嘴巴比crocodile宽一些，短一些。参见剑桥字典的解释：
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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