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Delegates from China Gezhouba Group Co., Ltd and Lao's Chaleun Sekong Energy Company attend a signing ceremony for Nam Kong 3 hydropower station contract in Vientiane, Laos, Nov. 15, 2017. (Xinhua/Liu Ailun)

Delegates from China Gezhouba Group Co., Ltd and Lao's Chaleun Sekong Energy Company attend a signing ceremony for Nam Kong 3 hydropower station contract in Vientiane, Laos, Nov. 15, 2017. (Xinhua/Liu Ailun)