否则会因为川普对学生签证政策改变、可能再也回不来了。 

Dear I-20 International Students: 

On Monday, January 20, 2025, all of you should be physically in the United States. Traveling outside the United States on or after that date is not advised. If you do decide to travel internationally after that date and you encounter difficulties with re-entry into the United States, there may be very little we in the Office of International Student Services can do to assist. 

If, for whatever reason you must travel internationally, please do so and have it completed before January 19, 2025. Make no plans to be outside the United States after that date. 

from Cornell university internationally Office