B1 an occasion when something gets better or when you make it better改进,改善
More examples
There's been a definite improvement in your English since you arrived.
Billy's work at school has shown signs of improvement this year.
Local parents successfully campaigned for safety improvements at the playground.
The report suggests that there has only been a marginal improvement in women's pay over the past few years.
The improvement in sales figures had a beneficial effect on the company as a whole.
noun
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