A 5-meter-long bamboo pole, the part inserted into the water is 2 meters, denoted as -2 meters. So how to remember the part exposed to the water?
一根5米长的竹竿，插在水中的部分有2米，记作-2米．那么露出水面的部分如何记？
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>