20 Li Zhijun , Sui Jixue, Dong Xuyu, Zhang Tao,1991. Preliminary Statistics of Some Sea Ice Conditions in Liaodong Gulf Abstracts of 6th International Symposium on Okhotsk Sea and Sea Ice[PDF是什么意思_20 Li Zhijun , Sui Jixue, Dong Xuyu, Zhang Tao,1991. Preliminary Statistics of Some Sea Ice Conditions in Liaodong Gulf Abstracts of 6th International Symposium on Okhotsk Sea and Sea Ice[PDF在线翻译_英语_读音_用法_例句