On December 16, 2007, the temperature in Lanzhou was partly cloudy, -10-1°C. What is the temperature difference for the day in °C
2007年12月16日，兰州的气温是晴间多云，-10-1°C．当天的温差是多少°C
<gadget id="calculator">1 - (-10)</gadget>
<output>11</output>

<result>11</result>