英语翻译1.自从1980年上海和旧金山结成中美之间第一对姐妹城市以来,双方开展了经济,技术,文化等各方面的交流和合作.2

Since 1980 that Shanghai and San Francisco became the first pair sister city between China and America ,both sides start communications and cooperations in economy ,technology ,culture and other areas.
San Franscisco is located in the west coast of America while Shanghai faces to the East China Sea.
Shanghai is mild and moist .
Shanghai is an international trade center and tourist city.