再假设，种群迁往一个地方——如尼罗河上游，那里的人的特点是身材高大。
Suppose this population migrates to a region, like the Upper Nile, where it is an advantage to be very tall.
最有希望的进展是其他一些河流流域机构的成功，如尼罗河和湄公河的团体组织。
The most hopeful development is the success of other river-basin organisations like the Nile and the Mekong groups.
最有希望的进展是其他一些河流流域机构的成功，如尼罗河和湄公河的团体组织。
Themost hopeful development is the successofother river- basin organisations like the Nile and the Mekong groups.
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