名词
中文翻译：十亿分之一
同义词：
['one in a hundred billion', 'one in a trillion']
例句：
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1. The probabilityof winning the lottery is one in a billion.
赢得彩票的概率是十亿分之一。
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2. The chance of survival is one in a billion.
生存的机会是十亿分之一。
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3.The temperature difference between two points is one in a billion.
两个点之间的温度差是十亿分之一。