Residency Requirement: at least 1 on-campus-only course and at least 1 semester at Harvard Extension School or Harvard Summer School.

驻校需求：在一学期的哈佛延伸课程或哈佛暑期课程期间，须选修至少一堂的在校限定课程。

To maintain your status as a permanent resident, there are few requirements you must fulfill. One requirement is the residency obligation.

为了保留您的永久居住权身份，这里有一些要求需要你去满足，其中一条是居住义务。