英语词汇twenty-year是什么意思，twenty-year的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-电脑手机教程网

单词	twenty-year
释义	DEFINITIVE EXAMPLES 权威例句〔EXAMINE〕A team of scientists has been studying the effects of acid rain over a twenty-year period. 一组科学家对酸雨在20年时间里所产生的影响进行了研究。朗文写作活用
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