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在非洲大草原奥兰治河的两岸,成群的羚羊以一种叫莺萝的牧草为生。一位动物学家在这里发现了一个奇怪的现象:奥兰治河东岸的羚羊群繁殖能力比西岸的强,每分钟的奔跑的距离也多出13米。这些莫名其妙的差别,使这位动物学家百思不得其解。于是,他决定对两岸的羚羊进行长期的研究比较。据观察,奥兰治河两岸羚羊的种类和生存环境是相同的:都属羚羊类,都生长在半干旱的草原地带,所食的牧草也一样。究竟是什么原因使得东岸羚羊更强健呢?为了解开这个谜团,有一年,在动物保护协会的赞助下,这位生物学家做了一个试验:在奥兰治河东西两岸各捉10只羚羊,分别把它们送往各自原来生活区的对岸。跟踪观察结果显示,从东岸运到西岸的10只羚羊,一年后繁殖到14
On both sides of the Orange River in the savannahs of Africa, flocks of antelopes make a living from a pasture named Warbler. A zoologist discovered a curious phenomenon here: the antelopes on the east bank of the Orange River have a much stronger reproductive capacity than the West Bank, and they travel an additional 13 meters per minute. These inexplicable differences make the zoologist puzzled. As a result, he decided to conduct a long-term study of antelopes on both sides of the strait. It has been observed that the species and living environment of the antelopes along the Orange River are the same: all antelopes grow in the semi-arid grassland and the forage grass is the same. What makes the east antelope even more robust? In order to solve this mystery, one year, under the auspices of the Animal Protection Society, the biologist did a test: capturing 10 each on both sides of the Orange River Antelope, respectively, sent to their respective original living area on the other side. Follow-up observations show that from the east coast to the West Bank 10 antelopes, a year after breeding to 14