水资源本身具有质和量双重属性，二者互为依存。

Water resources have two attributes of quality and quantity, which depend on each other.

对课堂教学内容的评价应从质和量两个方面来进行。

The content should be assessed by the quality and quantity of a lesson.

MS分析显示：烟叶表面二氯甲烷萃取物和叶内萃取物在化学成分方面存在质和量的差异。

The GC-MS composition analysis indicated that there were significant differences between surface extraction and inside extraction in quality and quantity.