A 3.7-meter-long bamboo pole is vertically inserted into the pool. The part of the bamboo pole that enters the mud is 0.4 meters, and the depth of the pool is 2.5 meters. Do you know how many meters the part above the water is?
一根3.7米长的竹竿垂直插入水池中，竹竿的入泥部分是0.4米，池水深2.5米，你知道露出水面的部分是多少米吗？
<gadget id="calculator">3.7 - 0.4 - 2.5</gadget>
<output>0.8</output>

<result>0.8</result>