The Ecuadorian population examined by Kronforst and his colleagues shows the same white and yellow variation found in Costa Rica but has not yet reached a level of strong reproductive isolation.

通过科瑞·福特斯和他的同事的调查得出，厄瓜多尔的蝴蝶种群与哥斯达黎加的蝴蝶种群一样，都具有白色与黄色种群的变异，但是并未达到一种显著的生殖隔离的水平。

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Because the world's total population was small, the earliest societies were able to survive in isolation.

因为那时世界的总人口数量很小，早期的社会可以在孤立状态下存活。

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Because the world's total population was small, the earliest societies were able to survive in isolation.

因为那时世界的总人口数量很小，早期的社会可以在孤立状态下存活。

youdao