翻译以下的英文：Part of the problem is understandable when employers

翻译以下的英文：
Part of the problem is understandable when employers evaluate employees, they often consider the amount of time on the job in addition to job performance employees know this, consequently, they work longer hours and take less vacation time than they did nine years ago, although many working people can do their job effectively during a reqular 40-hour work week they feel they have to spend more time on the job after normal working hours so that the people who can promote them see them