来自伦敦大学学院的研究科学家们一天中六次收集了男人和女人口中的唾液。
Research scientists from University College London collected saliva from the mouths of the men and women six times on a single day.
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昨天参观我们学校的那个男人来自伦敦。
The man who visited our school yesterday is from London.
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