Sitting, as opposed to lying down, further decreases blood return from the lower extremities because of the increased work that must be done against gravity.
坐着比躺着更能降低下肢血液循环，因为坐着要增加做功来克服引力。
2
Tom was lying on the lower bunk.
汤姆躺在下铺。
3
Lying in the territory in the northwest, southeast lower than the moderate middle.