If two cubes are big and small, and the ratio of their edge lengths is 2:1, then how many times the volume of the big cube is the volume of the small cube.
大小两个立方体，它们棱长的比是2：1，则大立方体的体积是小立方体体积的多少倍．
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<result>8</result>