" Annual" means once a year or every year.

“年” 是指一年一次或每年一次。

We have just scratched on 1.5 degree Celsius as an annual mean in 2023.

我们刚刚将 2023 年的年平均气温设定为 1.5 摄氏度。

In 2014 the Department for Environment, Food and Rural Affairs reported that, in the previous year, annual mean limits for NO-2 had been breached in 38 out of 43 sites.

英国环境、食品和农村事务部于2014年发布的一项报告称，2013年年间，43个城市中有38个城市的二氧化氮年平均含量超标。