billion years ago翻译
billion years ago的基本解释
读音: 美: 英:
十亿年前：指距今十亿年前的时间。
例句
The stars must have formed 10 to 15 billion years ago.这些恒星一定形成于100亿至150亿年前。《柯林斯英汉双解大词典》We were discussing the geological evidence of liquid water on Earth and Mars three to four billion years ago.我们讨论了30到40亿年前地球和火星上液态水存在的地质证据。
Flooding shaped the outflow channels approximately 3 billion years ago, about the same times as the northern volcanic plains formed.大约30亿年前，洪水形成了流出通道，大约与北部火山平原形成的时间相同。
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