The temperature of the coldest day in our county last year was -4～2℃. What is the temperature difference in our county on this day?
去年我县最冷的一天气温是-4～2℃，这一天我县的温差是多少℃．
<gadget id="calculator">2 - (-4)</gadget>
<output>6</output>

<result>6</result>