The length of the rectangle is 3 meters and its width is 2 meters. What is the circumference in meters?
长方形的长是3米，比宽多2米，周长是多少米？
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>