Flu cases have historically decreased after February.

二月份之后流感病例数出现历史性下降。

Sales of cow's milk had been decreasing for years.

多年来，牛奶的销量一直在下降。

Analysts say her plans indicate that her political power has decreased.

据分析她的计划表明她的政治力量已经减弱。

Theories include the changing seasons. Flu cases have historically decreased after February.

理论上，季节变化可能是因素之一。历史上来看，流感病例在2月份之后就会减。

The truth is, in most cases, although fat content decreases, calories have actually increased.

事实是，在大多数情况下，虽然肪含量降低，卡路里实际上被增加了。

Pollution levels are now decreasing allowing some folks to start flushing out their waterlines.

随着现在污染等级下降，一些民众能够用水冲洗输水管道。

Unable to wash downriver, the nutrients build up while dissolved oxygen in the water decreases.

养分因无法向下游流动而不断累积，同时水中的溶解氧量却在不断减。

And the overall numbers of police shootings have been decreasing.

警察枪击案的总数一直在减。

As altitude increases, atmospheric pressure decreases.

随着海拔的升高，大气压降低。

The cost of producing energy from sources like the sun and wind is also decreasing.

利用太阳能、风能等资源开发能源的成本也在降低。

Its demand is rising while its supply is decreasing, to put it in economic terms.

从经济角度来看，其需求在上升，供应却在下降。

But at the same time, levels of the dangerous chemical sodium cyanide have been decreasing.

但与此同时, 危险化品的氰化钠一直在减。

And then the trigger was when all of a sudden, international aid decreased.

触发性因素就是，国际援助突然间减。

Typical symptoms include decreased urinary and bowel control, decreased sexual function, and saddle anesthesia.

典型症状包括排便、排尿控制能力下降，性功能下降以及鞍区感觉丧失。

Face-to-face contact is decreasing because of the Internet.

互联网的出现让面对面的交流逐渐减。

For decades, bee colonies have been decreasing in America though they've been growing elsewhere.

几十年来，尽管蜂群在其他地方在增长，但在美国一直在减。

Ethanol -- intake of alcohol -- will decrease neurogenesis.

乙醇--酒中摄取-- 会降低神经新。

Let's create some names that decrease it.

让我们想一些可以降低血压的名字吧。

So it means the changes are decreasing.

这意味着变化正在减。

There are many reasons for this decrease.

造成人数下降的原因有很多。