December 22, 2012 is the winter solstice. The temperature in Taozhuang on this day is -4℃～4℃. What is the temperature difference in Taozhuang on this day?
2012年的12月22日是冬至，这一天陶庄的气温为-4℃～4℃，这一天陶庄的温差是多少℃
<gadget id="calculator">4 - (-4)</gadget>
<output>8</output>

<result>8</result>