classifying the items of work

例句：

1. 1. Thescientists classified the samples into different categories.
   科学家们将样本分成了不同的类别。
2. 2. The newlaw will classify all types of vehiclesaccording to their emissions.
   新法律将根据车辆的排放量将其分类。
3. 3. The studentswere asked to classify the books bysubject.
   学生们被要求按科目对书籍进行分类。