The lowest temperature in a certain area yesterday was minus 3°C, and the highest temperature was minus 4°C, what is the difference in °C between them?
昨天某地区最低气温是零下3℃，最高气温是零上4℃，它们相差多少℃．
<gadget id="calculator">4 - (-3)</gadget>
<output>7</output>

<result>7</result>