The size of the base of a cylinder remains the same, but the height increases (2/3), and the volume remains the same.
一个圆柱的底面大小不变，高增加了(2/3)，体积就是原来的多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>