If the length and width of a cuboid are doubled respectively, but the height remains the same, how many times its original volume is now.
一个长方体的长和宽分别扩大2倍，高不变，现在它的体积是原来的多少倍．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>