当然，也可能太阳系外智能的、有着科学思维的外星物种，其演化是很容易的。
Of course, there is the possibility that intelligent, scientifically minded alien species do evolve quite readily on extrasolar planets.
除了语言内部的机制外，社会因素也是实现其演化的强大推力。
Besides the internal system of language, the social elements are also the great forces to realize its evolution.
蝙蝠的翼是演化过程中由前肢演化而来。除拇指外，前肢各指极度伸长，有一片飞膜从前臂、上臂向下与体侧相连直至下肢的踝部。
Their wings are evolutionary modification of the forelimbs, with greatly elongated fingers joined by a membrane that extends down the side of the body.
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