average rate of progressive increase

例句：

1. 1.The team's performance was average compared to last season.
   这个队的表现在上个赛季相比是平均的。
2. 2.The average salary for a software engineer is around $70,000 per year.
   软件工程师的平均年薪约为每年7万美元。
3. 3. The average temperature in the city is 25 degrees Celsius.
   该市的平均气温为25摄氏度。