一线城市英语是:first-tier city。
例句:
In 2010, Huida will focus on the top and brand for protection, on the distribution of channels, Huida will speed up the penetration from first-tier city to, second-tier and third tier regions.
2010年惠达将会从高判指含端发力,用品牌护航逗桐并且在渠掘笑道的布局上,惠达会加快从一线城市渗透到二线、三线地区的步伐。