A Comparison of Marine Economy and Marine Industrial Structure Between China and the US: A Pragmatic Study Based on the Fact That China Surpassed the US in Marine Economic Output Yaoguang Zhang, Kai Liu, Shengyun Wang, Huan Liu, Guichun Liu, Fei Peng, Zeyu Wang, Yuan Gao, Peng Gao 2016, ( 11 ): 1614 -1621 DOI: 10.13249/j.cnki.sgs.2016.11.002