Fold a rope in half 3 times, this is the length of each part is the length of the rope.
把一根绳子，对折3次，这是每一份的长度是这根绳子的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 * (1/2) * (1/2) * (1/2)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>