A conical container with a height of 12 cm is filled with water and then poured into a cylindrical container with the same height as its bottom. What is the height of the water surface in cm?
一个圆锥形容器，高12厘米，里面装满了水，然后倒入与它等底等高的圆柱容器内，这时水面的高是多少厘米？
<result>4</result>