Xiao Ming's height is equivalent to Xiao Gang's (4/5), Xiao Ming is much shorter than Xiao Gang.
小明的身高相当于小刚的(4/5)，小明比小刚矮多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>