暑假里,孩子喜欢用妈妈的书在客厅搭多米诺骨牌。爸爸配合着搬凳子、搬桌子。到了多米诺骨牌的最后一个环节,孩子要用杠杆原理把沉重的实木椅子掀翻。在一阵眼花缭乱的倒塌后,椅子重重地砸在了地板上。孩子问:“爸爸,杠杆原理是阿基米德‘发明’的吗?” In summer vacation, children like to use their mother’s book in the living room to take dominoes. Father with the move stool, move the table. To the last part of the dominoes, children use the lever principle to lift the heavy solid wood chairs. After a dazzling array of collapses, the chair hit the floor heavily. The child asks: “Dad, is Lever principle Archimedes ’invented’?”