A piece of square steel is 2 meters long and its cross section is a square with side length 1 decimeter. What is the volume of this piece of square steel in cubic decimeters?
一段方钢长2米，横截面是边长为1分米的正方形，这段方钢的体积是多少立方分米．
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">1 * 1 * 20</gadget>
<output>20</output>

<result>20</result>