average balance

例句：

1. 1. Theaverage temperature in winter is around 5°C.
   冬天的平均温度大约是5°C。
2. 2. The average income for a doctoris much higher than the average salary.
   医生的平均收入远高于平均工资。
3. 3. The average life expectancy for people born in the 1960s is 78years.
   1960年代出生的人的平均预期寿命为78岁。