スラッシュ・リーディングの添削指導しています。

①  Today, in many parts of the world, it is customary for people to shake hands on meeting, as a gesture of good will. Originally, however, the practice of shaking hands has a more practical purpose.
②  Shaking hands originated in medieval times. In those days, when a man came across a stranger, he would often reach for his weapon out of fear in spite of himself with his right hand, in case he had to use the weapon to defend himself. Sometimes, the two men had been circling around each other, with weapons in their hands, until they laid aside the weapons. Then the two persons extended their right hands to show they had no weapons.
③  It is not known when and why the handshake changed from a simple clasping of hands to include a shaking movement. This shaking movement of the clasped hands probably started as early as the sixteenth century.