classification of income by sources

例句：

1. 1.The scientists classified the new species into differentgroups.
   科学家们将新物种分成不同的组。
2. 2.The museum has a classification chart for visitorsto follow.
   博物馆有一个分类表供游客参考。
3. 3. The classifier is responsible for organizingand categorizing the data.
   分类器负责组织和分类数据。