| 单词 | gradual improvement | 
| 释义 | gradual improvement It's a slow, gradual improvement through the week.   Times, Sunday Times (2014) The coach has overseen a gradual improvement in performances this season.   Times, Sunday Times (2007) There has been a gradual improvement in security over the past year, but bombs continue to claim lives.   Times, Sunday Times (2009) | 
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