Process a cylindrical wood with a volume of 31.4m**3 into a conical shape with the same base and height, and the cut volume is equivalent to the volume of the cylinder
把体积为31.4m**3的圆柱形木料加工成和它等底等高的圆锥形，削去的体积相当于圆柱的多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

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