英语词汇retroactivity怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	retroactivity
释义	ret·ro·ac·tiv·i·ty /ˌretrəʊækˈtɪvətɪ/ n.
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