classification and imputation of transaction

例句：

1. 1. Theresearchers classified the data into different categories.
   研究人员将数据分成了不同的类别。
2. 2.The scientists are working on a classification of plant species.
   科学家们正在研究植物物种的分类。
3. 3.The museum has organized a display to classify the exhibits by theme.
   博物馆已经组织了一个展览，按照主题对展品进行分类。