倘若您不小心將課程退選，只要課程時間尚未結束，便可再次加選此課程。
再次加選後，您先前的修課紀錄（例如：作業測驗的繳交紀錄）仍然存在，並不會重新來過。
If you drop from the course, you can enroll again while the course is still open.
Your learning record will still be there, you don't need to start over again.