1在从猿到人的转变过程中,劳动起着决定性的作用。为了取得生活资料,人类的祖先学会了如何使自己的手适用于一些劳动所需要的动作。这些动作,最初是非常简单的,后来慢慢复杂起来,一直到可以把一块石头做成刀子形状的时候,手才变得更加自由,能够不断获得新的技巧。经过几十万年的长期劳动,为了经常要跟越来越复杂的动作相适应,手的筋肉、韧带乃至骨骼,发生了变化,终于创造了人类特有的一双完善的手。 1 Labor plays a decisive role in the transition from ape to man. In order to obtain means of subsistence, human ancestors learned how to apply their own hand to some of the movements required for labor. These movements were initially very simple and slowly complicated. Until a stone can be made into a knife shape, the hands become more free and constantly gain new skills. After hundreds of thousands of years of long-term labor, in order to constantly adapt to more and more complex movements, hand muscles, ligaments and even bones have changed and finally created a pair of perfect human hands.