当你伸开手掌,仔细观察手指末端腹侧面,你会发现有一条条的纹路,并且每个手指的纹路形状不一样。这种在手指末端指腹上由凹凸的皮肤所形成的纹路,称为指纹,它能使手在接触物体时增加摩擦力,从而更容易抓紧物件,这是人类进化过程中自然形成的。指纹上面有经身体自然分泌物如汗 As you stretch out your palm and carefully observe the ventral surface of your finger, you will notice that there is a pattern of lines and the shape of each finger is different. This pattern of streaks of skin on the pulp of the finger at the end of the finger, known as fingerprints, increases the amount of friction the hand touches the object, making it easier to grasp the object as it naturally evolves during human evolution. Fingerprints above by the body’s natural secretions such as sweat