The school wants to dig a cylindrical reservoir on the playground. The diameter of the bottom surface is 4m, and the depth of the pool is 2m. After the construction, how many liters of water can this pool hold?
学校要在操场上挖一个圆柱形的蓄水池，底面直径是4m，水池深2m，建好后，这个水池能装多少升水？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 2 * 1_000</gadget>
<output>25_120</output>

<result>25_120</result>