Many have already spent a lifetime fighting in the grassy plain on either side of the Upper Nile.
许多士兵已经在上尼罗河两岸的这片草原上战斗了一辈子。
Suppose this population migrates to a region, like the Upper Nile, where it is an advantage to be very tall.
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.
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。
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