double source double streamer method

例句：

1. 1. The company has a double source of revenue from its online and offline sales.
   该公司通过线上和线下销售拥有双重收入来源。
2. 2. The research team identified two important sources of information for their study.
   研究团队确定了研究中的两个重要信息源。
3. 3.The project aims to tap into both local and international markets as a double source of growth.
   该项目旨在同时开拓本地和国际市场，作为增长的双重来源。