传说牛顿(Newton)坐在花园中看见苹果掉到地上,于是就悟出万有引力的定律。有史以来有多少人象牛顿一样看见过苹果落地,为什么没有人从而引出物理上的规律呢?莱耐克(Laennec)在街上看见两个孩子呆在一根长木的两端,一个在一端轻轻敲打,另一个把耳朵贴在另一端听。莱耐克受到启发就发明了听诊器, It is said that Newton sat in the garden and saw the apple fell to the ground, and he realized the law of gravitation. How many people have seen apples landed like Newton ever, why no one leads to physical laws? Laennec saw two children on the street to stay at the ends of a longwood, one at one end Tap, and the other sticks your ear to the other end. Inspired by Lenex, he invented the stethoscope.