semiaverage method

例句：

1. 1.The semiaverage score is 85 out of 100.
   半平均成绩是85分。
2. 2. The median age for women in their twenties is 26 years old.
   女性在二十几岁时的平均年龄是26岁。
3. 3.The average temperature in January is 4°C.
   一月的平均温度是4°C。