Divide a rope into 5 sections on average, ((())/(())) means to take 2 of them.
把一条绳子平均分成5段，((())/(()))表示取其中的2段．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>