有关手的数字每个人都有两只手,每只手上有8块腕骨、5根掌骨、14节指骨、59条肌肉和三大神经枝干。此外,手上还有特别发达的血管系统。这些部件的巧妙组合,使得我们的双手灵活自如。在人的一生中,双手几乎时时刻刻都不安静。有人做过测算,除了睡觉以外,我们的双手一般总要屈伸指关节,一生总计在2500万次以上。伸出你的手,每只手上有5个指头,它 Each hand has two hands, each with eight carpal bones, five metacarpal bones, fourteen phalanxes, fifty-nine muscles, and three major nerve branches. In addition, there is a particularly well-developed vascular system in our hands. The ingenious combination of these parts makes our hands flexible. In one’s life, his hands are almost always quiet. Someone has done calculations, in addition to sleep outside, we always have to flexion and extension of both hands knuckles, life in a total of more than 25 million times. Reach out your hand with 5 fingers on each hand