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Photo taken on Oct. 31, 2018 shows the Nateuy No. 1 Tunnel construction by China Railway No. 5 Engineering Group in Luang Namtha province, Laos.(Xinhua/Liu Ailun)

Photo taken on Oct. 31, 2018 shows the Nateuy No. 1 Tunnel construction by China Railway No. 5 Engineering Group in Luang Namtha province, Laos.(Xinhua/Liu Ailun)