[誤] The grain output in this province has increased year after year.
[正] The grain output in this province has increased year by year.
注:year after year(年復一年地)和 year by year(逐年地)的區(qū)別在于:后者分別看待年份;而前者集中看待年份(含“年年如此”甚至有“長此以往”之義。)根據(jù)原意,應選用 year by year。