If the height of a cylinder shrinks to the original (1/2), and the radius of the base expands to twice the original, then what is its volume.
如果一个圆柱的高缩小到原来的(1/2)，底面半径扩大到原来的2倍，那么它的体积就多少．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<result>2</result>