我到学校去找有关抵押金的项目(抵押金是不是deposit啊?),发现怎么说“Students that are admitted under regular decision will be asked to submit their $250 enrollment deposit by April 15. ”
Different university has different concept of deposit. Some require deposit even if you get fellowship. Usually it is mandatory no matter what kind of financial aid you got. If you don't pay, they won't keep the spot for you.