Fill a conical container with a height of 12 cm with water and pour it into a cylindrical container with the same height as its bottom. What is the height of the water surface in cm?
把一个高12厘米的圆锥形容器盛满水，倒入和它等底等高的圆柱形容器中，水面的高度是多少厘米．
<result>4</result>