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South Korean Prime Minister Lee Nak-yon delivers a speech at the opening ceremony of the Boao Forum for Asia Seoul Conference in Seoul, capital of South Korea, Nov. 20, 2018. (Xinhua/Wang Jingqiang)

South Korean Prime Minister Lee Nak-yon delivers a speech at the opening ceremony of the Boao Forum for Asia Seoul Conference in Seoul, capital of South Korea, Nov. 20, 2018. (Xinhua/Wang Jingqiang)