The perimeter of a rectangle is 18 centimeters. If the width remains the same and the length is reduced by 2 centimeters, what is the perimeter of the rectangle in centimeters?
一个长方形的周长是18厘米，若宽不变，长减少2厘米，则这个长方形的周长是多少厘米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">18 - 4</gadget>
<output>14</output>

<result>14</result>