There is a ratio, the two inner terms are reciprocals of each other, one outer term is 2, and the other outer term is what
有一个比例，两个内项互为倒数，一个外项是2，另一个外项是多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>