become more and more of a concern这是什么用法啊,或者这里面有什么

become more and more of a concern这是什么用法啊,或者这里面有什么 请问：more and more of the substance.这里的more and more 是什么词性? more and more用法 more and more 用法 show more and more concern on sth用法和搭配对吗? if not more,在这里是什么用法? more and more vapour become the Our city__（become)more and more beautiful. more and more的用法 有 a lot of more fun的用法吗? many more是什么用法啊 这两句话(或者短语a few more weeks和a few weeks more）有什么区别?