In the evening of a certain day, the temperature dropped from 5°C above zero at noon to 1°C below zero, by how much °C did the temperature drop.
某日傍晚，气温从中午的零上5°C下降到零下1°C，气温下降了多少°C．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>