Yachts compete during Haikou Offshore Race at 2019 Round Hainan Regatta(1/5)

Yachts compete during the Haikou Offshore Race at the 2019 Round Hainan Regatta in Haikou, capital of south China's Hainan Province, March 16, 2019. (Xinhua/Yang Guanyu)

Yachts compete during the Haikou Offshore Race at the 2019 Round Hainan Regatta in Haikou, capital of south China's Hainan Province, March 16, 2019. (Xinhua/Yang Guanyu)

Yachts compete during the Haikou Offshore Race at the 2019 Round Hainan Regatta in Haikou, capital of south China's Hainan Province, March 16, 2019. (Xinhua/Yang Guanyu)

Yachts compete during the Haikou Offshore Race at the 2019 Round Hainan Regatta in Haikou, capital of south China's Hainan Province, March 16, 2019. (Xinhua/Yang Guanyu)

Yachts compete during the Haikou Offshore Race at the 2019 Round Hainan Regatta in Haikou, capital of south China's Hainan Province, March 16, 2019. (Xinhua/Yang Guanyu)