单词 | 亿万年 |
例句 | DEFINITIVE EXAMPLES 权威例句〔billions〕Biological systems have been doing this for billions of years.生态系统亿万年来一直都是这样。外研社新世纪〔billion〕Biological systems have been doing this for billions of years.生物系统亿万年来一直都是这样。柯林斯高阶 |
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