... sigma matrix 骨架的中子俘获截面 sigma unit 西格马单位 sigma water 水中子俘获截面 ...
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... 收缩估计量 shrinkage estimators 疾病调查 sickness survey 标准差单位 sigma unit ...
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Ford Hickson, a senior research fellow with the University of Portsmouth's Sigma Research unit, says HIV prevention over the past 20 years has taken a singular route - safe sex, and reducing exposure .
BBC: NEWS | UK | Magazine | 'Morning-after' pills for HIV?
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