There has been below average rainfall this month.

这个月的降雨低于平均降雨量。

She was of below average height, petite and slender.

她低于平均身高，娇小且苗条。

There have been four years of below average rainfall.

已经有4年降雨量低于平均水平了。

Her work was well below average for the class.

她的功课远在班上的中等水平以下。

If you do, you get a below average produce.

如果你做了，你只会得到低于平均水平的产品。