李世珍 肖应凯 研究员 ： 本文系统而简要地介绍了硼的分离纯化，硼含量和硼同位素组成的测定。

Abstr act: In this study, the methods of preparation and isotopic measurement of boron are introduced systematically and briefly.

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根据他这项24小时人体节奏性的研究结果，凯利博士呼吁学校上课时间和企业上班时间应重新调整。

Dr Kelley called for staggered start times at schools and workplaces as a result of research into the human body's 24 hour rhythms.

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我的大学导师，J.C凯西，对我的人生有过重大影响。她既是我的导师又是我的朋友，是她鼓励我把新闻工作当成是一个应奋斗终生的职业。

My college adviser, J. C. Casey, had a big impact on my life. She was a mentor and friend. She encouraged me to consider journalism as a career.

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