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有位动物学家在对生活在非洲奥兰治河两岸的动物考察中,发现了一个奇怪的现象:生活在河东岸的羚羊繁殖能力比西岸的强,并且它们的奔跑能力也大不一样,东岸羚羊奔跑速度每分钟要比西岸的羚羊快13米。
A zoologist has discovered a strange phenomenon in the investigation of animals living on the banks of the Orange River in Africa: The antelopes that live on the east bank of the river have more reproductive capacity than the West Bank, and their ability to run is very different. The east coast antelope runs 13 meters faster per minute than the West Bank antelope.