The mineral content of groundwater normally increases with the depth, but even quite shallow aquifers can be highly saline.
地下水的矿物含量通常随深度的增加而增加，但即使很浅的蓄水层中可能含盐量也很高。
2
Even bunkered in his Bab al-Aziziya military base, the colonel maintained his strategic depth.
即使在阿齐齐亚兵营军事基地藏身，上校仍保持着战略纵深。
3
The artists were highly skilled at using, or even enhancing, the natural shape of the cave walls to give depth and perspectives to their drawings, the sense of motion and vitality in these animals.