学生的平均年龄是16岁。
The ___average age of the students is 16 years.
夏季,这里的平均温度大约是25°C。
In summer, the ___average temperature here is around 25°C.
这个地区的平均降雨量是每年500毫米。
The ___average rainfall in this region is 500 mm per year.