One morning the temperature was 15.2 degrees Celsius, it was 7.4 degrees Celsius higher at noon, and it was 6.8 degrees Celsius lower at night than at noon. What is the temperature in Celsius tonight?
某天早上的气温是15.2摄氏度，中午升高了7.4摄氏度，晚上又比中午降低了6.8摄氏度．这天晚上的气温是多少摄氏度？
<gadget id="calculator">7.4 - 6.8</gadget>
<output>0.6</output>

<gadget id="calculator">15.2 + 0.6</gadget>
<output>15.8</output>

<result>15.8</result>