A rectangular vegetable field in the school is 8 meters long and 6 meters wide. It is necessary to dig a drainage ditch around the vegetable field. What is the minimum length of the drainage ditch?
学校的一块长方形菜地长8米，宽6米，要在菜地的四周挖一圈排水沟，排水沟至少要挖多长？
<gadget id="calculator">8 + 6</gadget>
<output>14</output>

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

<result>28</result>