In order to measure the depth of the water in the pool, Wang Lin stretched a 4.6-meter-long bamboo pole vertically into the pool, and then measured that the part of the bamboo pole above the water was 1.2 meters. Please calculate how deep the water is?
王林为了测量池中的水有多深，他用一根全长4.6米的竹竿垂直伸入池中，然后测量得露出水面部分的竹竿是1.2米，请你计算水有多深？
<gadget id="calculator">4.6 - 1.2</gadget>
<output>3.4</output>

<result>3.4</result>