一级城市 meaning in English

first class city

And environmental regulation in beijing , shanghai and other leading cities has been tightened ahead of the 2008 olympics
北京、上海和其他一级城市已经决定在2008年奥运会之前就加紧做好环境治理的工作。
Its branch was set up in shenzhen in 1998 and now its projects are spreading in beijing , shanghai , guangzhou , shenzhen , wuhan , changsha , chengdu , chongqing , zhengzhou , changchun , hangzhou , sanya etc big cities in china
九八年成立深圳分公司，目前公司项目遍及北京、上海、广州、深圳、武汉、长沙、成都、重庆、郑州、长春、杭州、三亚等多个国内一级城市。
Many scholars have more studies to the house demand preference of one class city , but it is lacking to second city . so the paper chose mianyang as second class city to be the object researched . i wish that the research have certain reference meaning to the mianyang and similar second class city when another people study further the problem of the real estate district market
在住房需求偏好研究方面,国内学者不乏对一级城市的研究,但对二级城市的关注度相对不高,本文则以二级城市绵阳作为研究对象,希望对绵阳和与绵阳相类似的二级城市在进一步研究区域房地产市场问题时有一定的借鉴意义。