A road has been repaired less than the one that has not been repaired (1/4), how much of this road has been repaired at this time.
一条路，已修的比没修的少(1/4)，这时修了这条路的多少．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>