这是一个关于智慧的故事，年仅六岁的曹冲，运用"等量替换法"，利用漂浮在水面上的物体的重力等于水对物体的浮力这一物理原理，用石头就解决了一个连许多有学问的成年人都一筹莫展的大难题。说明孩子的智慧也是无限的。（This is a story about wisdom. Cao Chong, a six years old boy only, used rocks based on physical principles of equivalence between object floating on the water and buoyancy of water to solve a difficult problems that could be solved by well educated people via equivalent replacement method, demonstrating that the wisdom of a child can be infinite. ）