Classified the Marine tourism resources of Oingdao city into Marine physical tourism resources and Marine human tourism resources according to the classical classification method.

根据经典的旅游资源分类方法，将青岛市的海洋旅游资源分成海洋自然旅游资源和海洋人文旅游资源。

youdao

Using clustering analysis method on the classification of Chinas urban air quality levels, gather into the city air quality in most similar category, analysis of causes, concluded.

运用聚类分析方法对我国城市空气质量等级进行分类，把空气质量状况最相似的城市聚成一类，分析原因、得出结论。

youdao

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

"The utilisation of sex as a classification method is rational, since it is a straight forward way to ensure that birth records in the City of New York are uniform, " lawyers for the city wrote in a court filing.

BBC: Transgender Americans take on New York