Insert a 3.5-meter-long bamboo pole into the bottom of the swimming pool. The part above the water is 1.9 meters long. How deep is the water here?
将一根3.5米长的竹竿插入游泳池池底，露出水面的部分长1.9米，这儿的水深多少米？
<gadget id="calculator">3.5 - 1.9</gadget>
<output>1.6</output>

<result>1.6</result>