英语词汇“数十亿年”的释义、用法及例句翻译-英汉例句词典

词汇	数十亿年
例句	The process of biological evolution has taken billions of years.生物进化的过程长达数十亿年。A primitive form of microscopic life may have existed on Mars billions of years ago.微生物的原始形态可能数十亿年前就已在火星上存在了。
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