A piece of wood has a cross-sectional area of 28 square decimeters and a length of 5 meters. What is its volume?
一根木料的横截面的面积是28平方分米，长5米，它的体积是多少．
<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">28 * 50</gadget>
<output>1_400</output>

<result>1_400</result>