The second part: Laos development plan of Mekong river basin.
第二部分，老挝的湄公河流域开发规划。
Second: the evolution of the cooperative development of Mekong river basin.
第二，大湄公河流域合作开发的沿革。
There was lake development during late Pleistocene in the Yanhuai basin.
延怀盆地晚更新世发育湖相沉积。
There was lake development during late Pleistocene in the Yanhuai basin.
延怀盆地晚更新世发育湖相沉积。
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