The full length (2/9) of a rope is used up, and the rest is much longer than the used one.
一根绳子用去了全长的(2/9)，余下的比用去的多全长的多少．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">1 - (2/9)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">(7/9) - (2/9)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>