我们的手拥有穿针引线、砍柴等的能力,这是很神奇的。进化生物学家都不太了解为什么人类和绝大多数拥有四肢的地球生物,每个肢体都是五根。如果我们的手进化成六根手指,会生活得更好吗?多一根手指会使一些事情变得更容易,比如弹奏更复杂的乐器、更快地打字、更牢固地抓住物体。哈佛医学院的一位遗传学家Cliff Tabin说:“手掌变大会使打篮球变得更容易,”他研究过脊椎动物的肢体发育,“但我们能做出精细动作的灵巧双手主要是因 It is fantastic that our hands have the ability to thread needles and cut firewood. Evolutionary biologists do not quite understand why humans and most earth-based creatures with limbs are five in each limb. If our hands evolved into six fingers, would you live a better life? Adding one more finger makes things easier, such as playing more complicated instruments, typing faster, and holding the object firmly. Cliff Tabin, a geneticist at Harvard Medical School, said: ”Changing hands makes basketball easier,“ he studied vertebrate limb development, ”but we can make fine movements with both hands dexterous because