A bamboo pole is 1.2 meters long above the water surface. The total length of the bamboo pole is 4.6 meters. How deep is the water in meters?
一根竹竿，露出水面部分长1.2米．竹竿全长4.6米．水深多少米？
<gadget id="calculator">4.6 - 1.2</gadget>
<output>3.4</output>

<result>3.4</result>