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accumulation

noun
 OPAL W
🔊/əˌkjuːmjəˈleɪʃn/
🔊/əˌkjuːmjəˈleɪʃn/
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  1.  
    [uncountable] the process of gradually increasing or getting more and more of something over a period of time积累；积聚
    • the accumulation of wealth财富的积累
    Topics Change, cause and effectc1
  2.  
    [countable] an amount of something that has gradually increased over a period of time
    • an accumulation of toxic chemicals有毒化学物质的积聚
    Topics Change, cause and effectc1