A rectangular flower bed is 8 meters long and 6 meters wide. There is a guardrail around it, how many meters is the guardrail long?
一个长方形花坛，长8米，宽6米．四周围上护栏，护栏长多少米？
<gadget id="calculator">8 + 6</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>