area of source

例句：

1. 1. The research team studied the area of source to understand the impact of pollution on the environment.
   研究团队研究了来源区域以了解污染对环境的影响。
2. 2.The company's main source of revenue comes from its product line.
   该公司的主要收入来源是其产品线。
3. 3. The study focused on the area of source to identify the factors that contribute to the decline in productivity.
   该研究专注于来源区域，以确定导致生产力下降的因素。