A rectangular vegetable field is 3 meters long and 2 meters wide. How many meters is the circumference of this vegetable field?
一块长方形菜地，长3米，宽2米．这块菜地的周长有多少米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>