The train has traveled the whole journey (3/5), how much of the journey is left.
火车行了全程的(3/5)，还剩全程的多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

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