China's second aircraft carrier returns to dock at Dalian Shipyard in Northeast China's Liaoning Province, May 18, 2018, after its first sea trials. The aircraft carrier, the country's first domestically-built one, was launched in April last year and began the sea trials on May 13. (Photos: 81.cn) 

China's second aircraft carrier returns to dock at Dalian Shipyard in Northeast China's Liaoning Province, May 18, 2018, after its first sea trials. The aircraft carrier, the country's first domestically-built one, was launched in April last year and began the sea trials on May 13.  

China's second aircraft carrier returns to dock at Dalian Shipyard in Northeast China's Liaoning Province, May 18, 2018, after its first sea trials. The aircraft carrier, the country's first domestically-built one, was launched in April last year and began the sea trials on May 13.  

China's second aircraft carrier returns to dock at Dalian Shipyard in Northeast China's Liaoning Province, May 18, 2018, after its first sea trials. The aircraft carrier, the country's first domestically-built one, was launched in April last year and began the sea trials on May 13. 

China's second aircraft carrier returns to dock at Dalian Shipyard in Northeast China's Liaoning Province, May 18, 2018, after its first sea trials. The aircraft carrier, the country's first domestically-built one, was launched in April last year and began the sea trials on May 13. (Photo/81.cn) 

China's second aircraft carrier returns to dock at Dalian Shipyard in Northeast China's Liaoning Province, May 18, 2018, after its first sea trials. The aircraft carrier, the country's first domestically-built one, was launched in April last year and began the sea trials on May 13. 

China's second aircraft carrier returns to dock at Dalian Shipyard in Northeast China's Liaoning Province, May 18, 2018, after its first sea trials. The aircraft carrier, the country's first domestically-built one, was launched in April last year and began the sea trials on May 13.