Founded in 2001, Tianjin Dawanggu Economical Development Zone has the floor area of 3.09 sq.km. (2.1 sq.km had been developed) and 10 sq.km of planning area.是什么意思_Founded in 2001, Tianjin Dawanggu Economical Development Zone has the floor area of 3.09 sq.km. (2.1 sq.km had been developed) and 10 sq.km of planning area.在线翻译_英语_读音_用法_例句