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Vietnam, Trong said, is grateful to China for the tremendous help it has offered to Vietnam's national liberation and development, and supports China playing a bigger role in international and regional affairs.

Shanghai has 15 urban railway transit lines currently in operation, and three more will open by the end of the year, Xie Feng, director of Shanghai municipal commission of transport, told a press conference.

The gravitational waves were first discovered by the U.S.-based Laser Interferometer Gravitational-Wave Observatory (LIGO) detectors on Aug. 17. The Chinese telescope independently observed optical signals resulting from the merger the next day, among some 70 telescopes on the ground or from space across the world, according to the Chinese Center for Antarctic Astronomy.

"We should all look at it very seriously and should engage with it constructively," he said.

China's domestic tourism industry earned about 3.9 trillion yuan in 2016, and the country plans to raise tourism revenue to 7 trillion yuan by 2020.