There is a cylindrical tape with a width of 2 cm, an outer circle with a radius of 3 cm, and an inner circle with a radius of 2 cm. What is the volume of this cylindrical tape in cubic decimeters?
有一个圆柱形的胶带，宽2厘米，外圆半径是3厘米，内圆半径是2厘米．这个圆柱形胶带的体积是多少立方分米？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">56.52 - 25.12</gadget>
<output>31.4</output>

<result>31.4</result>