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词汇 十亿分之
例句 The sulphur dioxide level in the air was 32 parts per billion.空气中二氧化硫的含量是十亿分之三十二。Well before a billionth of a second had elapsed the universe started to grow exponentially.十亿分之一秒远未逝去,宇宙已开始成指数级地迅速增大。
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