Sometimes there's a flat fee for carrying out a particular task.有时执行某项特定的任务有固定的价码。For a monthly flat fee, paid by the consumer or employer, HMOs provide a specified list of medical services both in and outside the hospital.个人或雇主每月交纳固定费用，卫生维护组织向其提供医院内外的一系列特定的医疗服务。