Question: 海洋和谐号何时启航
Answer: 2019-12-29; 2019 12 29; 12/29/2019; 12 29 2019; 29 十二月 2019; 12-29-2019; 2019 十二月 29; 2019-12-29; 29 12 2019; 2019 december, 29; 29-12-2019; 29/12/2019