美国是一个发达国家。
美国是一个发达国家。
美国是一个发达国家，对比之下，墨西哥经济落后。
America is a developed country, in contrast, Mexico is economically underdeveloped.
在大型发达国家中，美国是唯一一个儿童比老人数量大的，也是少数几个工作年龄的人口还在增长的发达国家之一。
America will be the only big developed country where children outnumber pensioners, and one of the few developed countries where the working-age population is still growing.
在大型发达国家中，美国是唯一一个儿童比老人数量大的，也是少数几个工作年龄的人口还在增长的发达国家之一。
America will be the only big developed country where children outnumber pensioners, and one of the few developed countries where the working-age population is still growing.
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