aveage sample number

例句：

1. 1.The average temperature in winter is around 5 degrees Celsius.
   冬天的平均温度大约是5摄氏度。
2. 2. The average income of a worker is $30,000 per year.
   一个工人的平均年收入是3万美元。
3. 3. The average life expectancy for women over 65 is 12 years.
   65岁以上女性的平均预期寿命为12年。