A glass of milk, drank (1/3), how much is left in the glass
一杯牛奶，喝了(1/3)，杯中还有多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>