The number of white rabbits is less than the number of black rabbits (1/3), and the number of white rabbits is equal to the number of black rabbits.
白兔只数比黑兔只数少(1/3)，白兔只数是黑兔的多少．
<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>