“城市商业区”常见的英文表达是 "urban commercial district" 或 "city business district"。
urban commercial district：更加强调城市环境中的商业区域，“urban”意为“城市的”，“commercial district”指“商业区”。
city business district：直接点明是“城市里的商业区”，“business district”是常用表达商业区的短语。
例如：
The urban commercial district is bustling with activity day and night.（城市商业区日夜都热闹非凡。 ）
Many office workers like to have lunch in the restaurants around the city business district.（许多上班族喜欢在城市商业区附近的餐馆吃午饭。 ）