您可以选择华氏温标或摄氏温标。

You can also select Fahrenheit or Celsius.

定义一些参考点，例如摄氏温标定义水的沸点，是100摄氏度，冰点是0摄氏度。

And Celsius first used the boiling point of water, and called that 100 degrees Celsius, and the freezing point of water and called that zero degrees Celsius.