表一类人或事,用定冠词和不定冠词有什么区别?例如：The tiger and the cat are of the sa
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题目内容：
表一类人或事,用定冠词和不定冠词有什么区别?
例如：The tiger and the cat are of the same family of mammals
A dog is an animal that is often kept as a pet
上面两个句子可互换吗?
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