You can be reimbursed for out-of-pocket expenses when you are on a business trip.因公出差时，自费开支可以报销。The cost of private treatment can be prohibitive.自费治疗的费用高得让人望而却步。She travelled at her own expense to the Soviet Union.她自费去苏联旅行了一趟。She paid out of pocket for the prescription.她自费买了处方药。