A cup of soy milk, drink 1/3 of it, what fraction of this cup of soy milk is left?
一杯豆浆，喝了它的(1/3)，还剩下这杯豆浆的几分之几？
<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>