There is a desk in the school. The desktop is a rectangle with a length of 85 cm and a width of 34 cm. Xiaohua has a colored ribbon that runs around the desktop. Do you know how long this ribbon is in centimeters? (Please list calculation instructions)
学校里有一张课桌，桌面是一个长85厘米，宽是34厘米的长方形，小华有一根彩带正好沿着这张桌面围了一周，你知道这根彩带长多少厘米吗？(请列式计算说明)
<gadget id="calculator">85 + 34</gadget>
<output>119</output>

<gadget id="calculator">119 * 2</gadget>
<output>238</output>

<result>238</result>