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The division of city hierarchical structure is a multi-index classification problem.
城市规模等级结构的划分是一个多指标的分类问题。
youdao
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Do you have a garbage classification program in your city?
你所在的城市有垃圾分类计划吗？
youdao
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Do you have a garbage classification program in your city?
你所在的城市有垃圾分类计划吗？
youdao