The decrease in orbital altitude of an artificial satellite as a result of conditions such as atmospheric drag. 能量消減人造衛星由于大氣阻力等的作用結果，在軌道高度上能量消減
A decrease in signal power as measured between two points. 信號能量在兩點間測量出來的減小量。參閱signal。
There has been a steady decrease in population in this city. 這個城市的人口在持續下降。
A persistent decrease in the level of consumer prices or a persistent increase in the purchasing power of money because of a reduction in available currency and credit. 通貨緊縮由于可獲得貨幣和信貸的減少，導致消費品價格水平的持續下降或貨幣購買力的持續提高
