英文怎么说北京市海淀区北三环西路

二楼好些。或者直接beisanhuanxi road，应该也可以寄到

north third circle road , haidian district beijing

BeiSanhuan west Road, HaiDian District, Beijing

绝对标准，参考个别单位英文版

The Northern Third Circuit, Haidian District, Beijing, P. R. China

寄信最好写拼音。英文的话最后还是要翻译过来的。