A cylindrical column, the part buried underground accounts for 30% of the total, and the volume of the part exposed above the ground is 1.4 cubic meters, so what is the volume of the underground part?
一根圆柱形柱子，埋入地下部分占全部的30%，露在地面上部分的体积是1.4立方米，那么地下部分的体积是多少？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1.4 / (7/10)</gadget>
<output>2</output>

<gadget id="calculator">2 * (3/10)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>