After a bamboo pole with a total length of 2 meters is inserted into the water, the part above the water is 0.7 meters long. How deep is the water?
竹竿全长2米插入水中后，露出水面部分长0.7米，水深多少米？
<gadget id="calculator">2 - 0.7</gadget>
<output>1.3</output>

<result>1.3</result>