[dì jiǎn]
（一次比一次減少） decrease progressively [successively]; decrease by degrees; reduce progressively
a decrease of budget
預算遞減
The demand for tea is on the decrease (each year).
茶葉的需求量（逐年）遞減。
There has been a progressive decrease in population every year in this city.
這個城市的人口在逐年遞減。