过去一年，各项费用已经减少了20%。

Costs have been reduced by 20% over the past year.

《牛津词典》

由于经济放缓，顾客们已经减少了花销。

Customers have cut back spending because of the economic slowdown.

《柯林斯英汉双解大词典》

在过去的10年中，自动化已经减少了这里一半的劳动力。

In the last ten years automation has reduced the work force here by half.

《柯林斯英汉双解大词典》

As we'll talk about later in the class, the biodiversity has shrunk so what used to be hundreds of varieties of corn is now just a few.

像我们后面所要提到的,玉米种群的生物多样性已经从曾经的,几百种减少到了现在的几种

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Three years from now, that is after the next president has had time to enact this program and the program has had some time to begin taking effect will the number of illegal immigrants in the United States be higher, lower or about the same? Ken Judd.

年后，这期间，下届总统有可能制定相关法案,而该法案刚好也已经生效,美国境内的非法移民,是增多，减少还是持平？，肯·贾德你先来。

斯坦福公开课 - 经济学课程节选