average rate of profit

例句：

1. 1. The team's performancewas below average.
   这个团队的表现低于平均水平。
2. 2.The price of this product is just average.
   这个产品的价格只是平均水平。
3. 3. Theaverage lifespan of ahuman being is around 75 years.
   人类的平均寿命大约是75岁。