The volume of the cylinder remains the same, if the area of the base is enlarged to 4 times of the original, what should be the height?
圆柱的体积不变，如果底面积扩大到原来的4倍，那么高应该多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>