average low water flow

例句：

1. 1. The average temperature in winter is 5°C.
   冬季的平均温度是5°C。
2. 2. The average lifespan of a dog is 10 years.
   狗的平均寿命是10年。
3. 3. The average income for a doctor is $100,000 per year.
   医生的平均年收入是10万美元。