下降
平稳下降：
make a steady decrease 平稳下降
e.g. It is clear that the rate of smoking for both men and women made a steady decrease from 1985.
drop gradually 逐渐下降
This number dropped gradually to 500 by 1984 and continued to decrease until 2010.
a steady drop 平稳下降
a slight fall 微微下降
a gradual decline 逐渐下降
a small decrease 微微下降
tailing off 下降
Encouragingly, the number of minors being sent to custody in Britain seems to be tailing off:it fell by nearly a fifth between 1997 and 2007. 令人欣慰的是，英国被羁押的未成年人数目似乎正在逐渐降低。 1997至2007年期间，已经降低了近20%。
Variation tendency of annual runoff and amount of sand lost was identical basically , andthe quantity of water and sand at Huaxian gauging station was tailing-off continuously fromthe 1960 to 2005; 年径流量和年输沙量的变化趋势基本一致，而且自60年代 至2005年华县站的水沙量持续呈递减趋势；
As a result there's a very robust market of products that are marketed, may have plateauedor be tailing off in sales but that are still generating significant amounts of revenue.
这样，那些已经上市，销量已不增长甚至下降，但利润仍很可观的药物也形成一个稳定的交易市场。
falling off 下降
During the first week wires kept falling off from her body and were gone.
金属丝生长周时曾经出现过脱落迹象，甚至完全消失。
The figures show that despite the numbers of underage pregnancies falling off after 2002,they are now on the rise again.
数据显示，虽然在2002年未成年少女怀孕数量有所下降，但是现在又开始增加。
持续下降：
begin to decline and continue on this downward turn until... 开始下降，并持续走低，直到XXX年
But after 1994, the rate of smoking in females began to decline and continued on this downward turn until 2010.
急剧下降：
fall sharply 急剧下降
The number of cases of the disease then reached a peak on the 12th, fluctuating slightly until 15th, and then fell sharply over the following two days.
a dramatic fall
a sharp drop
a rapid plunge
a steep decline
上升：
a rapid leap
a sudden rise
a marked increase
a huge growth
a dramatic rise
保持平稳：
no change
a flat trend
the number remained unchanged
平稳，下降，上升的混合表达
remained steady, followed by a slight decrease before the number rose dramatically between...and .... 先保持平稳，之后有缓慢下降，接着又在....期间急剧上升
During the first few days of December, the number of cases of the disease remained steady, followed by a slight decrease before the number rose dramatically between the 8th and the 11th of December.
到达点
reach the peak 达到点
The number of cases of the disease then reached a peak on the 12th, fluctuating slightly until 15th, and then fell sharply over the following two days.
到达点
reach the lowest point 达到点
There was a slight increase up to the 19th when the number reported for the disease dropped steadily and finally reached their lowest point on the 31st of December.
两个主体整体趋势比较
remain lower than that of XXX during the entire period 在这段时间内整体比XXX更低
But the smoking rate of women remained lower than that of men during the entire period.
一个主体整体趋势比较
（两句话说和的地方）：
Overall, the number of pneumonia patients was high between the 7th and 15th of December. It is clear that by the middle of the month, there were only a few cases of pneumonia recorded.
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