If the base of the parallelogram is reduced to the original (2/3), and the height is expanded to 6 times of the original, then the area of the parallelogram is the same as the original.
把平行四边形的底缩小到原来的(2/3)，高扩大到原来的6倍，则平行四边形的面积就是原来的多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 * (2/3)</gadget>
<output>4</output>

<result>4</result>