以下为句子列表：
英文: A working equation expresses the unknown quantity in terms of the known ones.
中文: 分词短语出现在句尾，用逗号隔开，表示伴随情况说明，非常常见。
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英文: Already well aware of Hargreaves' virtues from international duty with England, Rio concedes the younger new arrivals are a little more of an unknown quantity - although United did sample Brazilian playmaker Anderson's trickery last summer.
中文: 英格兰国家队的共事使里奥已经了解哈格里夫斯的强大实力，而对于新来的年轻人，里奥则不是那么清楚他们的能力--尽管去年夏天曼联已经领教过巴西前腰安德森的厉害。
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英文: The new teacher is still very much an unknown quantity but we have hopes that he will be a valuable member of our team.
中文: 新教师是谁现在还难以预料，但我们希望他会成为我们队里的重要一员。
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英文: The passage builds the regression model of linear with one unknown quantity by the regression analysis of mathematical statistics and apply the model to population prediction.
中文: 摘要本文试用数理统计中回归分析的方法，建立我国人口总数与时间的一元线性回归模型，用于人口预测。
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英文: Though I may not be the most current test pilot, either operational or developmental, I am a known quantity to both communities.
中文: 尽管我可能不是最前沿的试飞员，也不是最前沿的作战人员和研发人员，但我了解这两个圈子里的大量事情。
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