The doctor had spoken with so much plainness that she was convinced to modify her treatment.医生讲得如此坦率，她被说服修改她的治疗方案。Because of his plainness of speech, he succeeded in making his point.由于他措词清楚，他成功地表明了自己的观点。There was an elegant plainness in this small house.这小屋子里有一种高雅的朴素。The very essence of truth is plainness and brightness.清楚与明白乃真理所特有之本质。