average loss of energy

例句：

1. 1. The average temperature in the city is 20 degrees Celsius.
   这个城市的平均温度是20摄氏度。
2. 2.He works hard to achieve an average level of success.
   他努力工作以获得平均水平的成功。
3. 3. The book's average rating is 4 out of 5 stars.
   这本书的平均评分是4星。