ISF

例句：

1. 1. ISF stands for "Institute of Social Studies".
   ISF 代表 "社会研究学院"。
2. 2. The ISF is a non-profit organization dedicated to promoting social welfare.
   ISF 是一个非营利组织，致力于促进社会福利。
3. 3. The ISF is responsible for organizing cultural events and promoting cultural exchanges.
   ISF 负责组织文化活动和促进文化交流。