The length of a rectangle is 70 cm. After cutting off the largest square, what remains is a small rectangle. What is the perimeter of the small rectangle in centimeters?
一个长方形长为70厘米，剪去一个最大的正方形后，剩下的是一个小长方形，则这个小长方形周长是多少厘米．
<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<result>140</result>