classification of economic grouping

例句：

1. 1. The scientists classified thesamples into different groups.
   科学家们将样本分成不同的组。
2. 2. The researchers are trying to classify the new species of bird.
   研究人员正试图对新鸟种进行分类。
3. 3. Theclassification of species is crucial for understanding evolution.
   物种的分类对于理解进化至关重要。