目的：探讨多变量缺失数据的不同处理方法对结果的影响。
Objective: To explore the results of different methods for managing multivariate missing data.
目的：观察研究不同处理方法对中药微量元素含量的影响。
Objective: To observe and study the influence of different treatments on trace elements content of Chinese herbal medicine.
对船舶压载水不同处理方法所需费用和代价进行了简要评述。
A review of costs of different methods for ships ballast water treatment is given in this paper.
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