Insert a 4-meter bamboo pole into the pool. The part of the bamboo pole that enters the mud is 0.25 meters, and the part above the water is 1.07 meters. How deep is the water in the pool?
把4米的竹竿插入水池，竹竿入泥部分是0.25米，露出水面的部分是1.07米，水池中水深是多少米？
<gadget id="calculator">4 - 0.25 - 1.07</gadget>
<output>2.68</output>

<result>2.68</result>