手是人类的万能工具。我们吃饭、穿衣、写字、弹琴、打球、种地、做工、操纵电脑,哪一样离得开手?有人估计,人的双手能做出上亿个动作。我们的手结构精细。一只手就有8块腕骨、5根掌骨、14根指骨、5 9条肌肉和发达的神经、血管系统。我们的手非常勤劳。在人的一生中,除了睡觉以外,双手几乎从不休息;手指屈、伸,至少2500万次。连躺在小床上的婴儿,也不时弯曲和摆弄着手指。 Hand is a human universal tool. We eat, dress, write, play the piano, play ball, grow, work, manipulate the computer, which kind of get away? Someone estimates that people’s hands can make hundreds of millions of actions. Our hand structure is fine. One hand has 8 carpal bones, 5 metacarpal, 14 phalanges, 59 muscles and well-developed nerves and vasculature. Our hands are very hardworking. In human life, except sleep, his hands almost never rest; finger flexion, extension, at least 25 million times. Even the baby lying on the crib, from time to time to bend and play with fingers.