英语词汇“parts-per-billion”的意思、用法、释义、翻译、读音、例句、短语、词组-英汉翻译词典-复社网

单词	parts-per-billion
释义	parts-per-billion un.十亿分之几 [网络]十亿分率范围内；十亿分之几数量级
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