My boss is very old-fashioned and I'm having a lot of trouble selling the idea of working at home occasionally.我的上司很守旧，我要费好大的劲才能使他相信偶尔在家里工作是个不错的主意。He walked slowly, his legs dragging with each step.他慢慢地走着，每迈一步都费好大的劲。Getting the floor clean required lots of muscle power.把地板弄干净要费好大的气力。