He became convinced of the need for cheap editions of good quality writing.他开始相信大众对优秀作品的普及本有需求。Quality controllers ensure that all our products are safe, wholesome, and of good quality.质量检验员确保我们所有产品都安全健康、品质良好。She always insists that her writing paper is of good quality.她一直坚持说自己的书写纸质量很好。