一國家家一年的溫差點計?

計算一年的溫差, 我們需要由每年最高的溫度減去每年低溫。
採取例子, 如果香港每年最高的溫度31.2 度和每年低溫11.2 度, 溫度的每年範圍是 31.2 - 11.2 = 20度

To calculate the annual range of temperature ,
we just need to subtract the annual highest temperature by the annual lowest temperature .

Take an example ,
if city A has an annual highest temperature of 31.2 degrees and the annual lowest temperature of 11.2 degrees ,
the annual range of temperature is
31.2 - 11.2 = 20degrees