If the ratio of length to width of a rectangle is 2:1, then the width is the length.
一个长方形的长与宽的比是2：1，则宽是长的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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