If the area of the bottom of the cylinder is reduced to 1/3 of the original, and the height is doubled, its volume will be reduced to the original
圆柱的底面积缩小到原来的(1/3)，高扩大2倍，它的体积就缩小到原来的多少
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>