人口对于城市来说是个大难题的翻译：Population for the city was a big problem 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Population for the city is a big problem

Population for the city was a big problem

The population regarding the city is a big difficult problem

Population is a major headache for the city

Population for the city was a big problem