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1·The price of wheat has decreased by 15%.

小麦价格降低了15%。《牛津词典》

2·The number of new students decreased from 210 to 160 this year.

今年新生人数从210减少到160。《牛津词典》

3·Fatal road accidents have decreased in frequency over recent years.

近年来致命交通事故发生率已经下降。《牛津词典》

4·The number of young people obtaining qualifications has remained static or decreased.

获得各种资格证书的年轻人的数量一直保持不变或者已经减少。《柯林斯英汉双解大词典》

5·The combination of hot weather and decreased water supplies is hurting many industries.

天气炎热和供水减少这两个因素结合在一起对很多行业造成了损害。《柯林斯英汉双解大词典》

6·Soil erosion decreased their crop yields.

土壤侵蚀降低了他们的作物产量。

7·Global measles deaths decreased by 78% during this period.

在此期间，全球麻疹死亡率下降了78%。

8·While Spain as a whole is heating up quickly, temperatures near the greenhouses have decreased.

尽管整个西班牙的气温迅速上升，但温室附近的气温却下降了。

9·Frank Arroyo said that his rental business has decreased by 90% since Citi Bike was rolled out last month.

弗兰克·阿罗约说，自从上个月花旗集团推出自行车以来，他的租赁业务已经减少了90%。

10·Others see a conspiracy of big businesses, causing decreased competition, increased fares and fewer choices.

其他人则认为这种大企业的阴谋导致竞争的减少、票价的上涨和选择的减少。

减少了

1·Make changes to your original query one at a time, and test to see if the performance has improved (decreased response time).

一次修改原始查询的一个地方，并进行测试，以查看是否提高了性能(减少了响应时间)。

2·When his influence began to shrink, his wealth also decreased.

当他的影响缩小时，他的财富也减少了。

3·When IT professionals willingly apply valued IT assets on a regular basis, overall governance costs are decreased because less investment is required to enforce and validate usage of those assets.

当IT专业人员愿意在常规的基础上应用有价值的IT资产时，整体的治理成本减少了，因为不需要投入很多来强迫并验证那些资产的使用。

4·Summer precipitation has decreased and the increase in population has put pressure on the region's water supplies.

而夏季降水却减少了，人口也增加了，这对该区的供水也造成了压力。

5·This also decreased neurogenesis in the hippocampus.

这样之后，海马体的神经形成也减少了。

减小了

1·Lightning and thunder gradually decreased.

闪电和雷声逐渐地减小了。

2·The net effect is that the application developer can devote more attention to the business logic, and the gap between the problem and solution space is decreased.

净效应是应用程序开发人员可以更多地关注业务逻辑，而问题和解决方案之间的鸿沟减小了。

3·The switch frequency is increased and the output harmonic is decreased while the overcurrent protection is ensured.

保证过电流保护的同时，还提高了开关频率，减小了输出谐波。

4·Both of attribute weight frequency and strong compressible set are used to simplify discernibility matrix so that computing complexity is decreased and reduction efficiency is increased.

同时利用属性加权频率和强等价集概念化简区分矩阵，既减小了计算复杂度又提高了约简效率。

5·Using this method in spiral bevel gears' setting, the noise could be reduced, the vibration be decreased and the precision of transmission be ensured.

采用该方法对弧齿锥齿轮进行装配和调试，降低了噪声，减小了震动，保证了传动精度。

有所减少

1·It has also been observed that starting with CM v8.3 fix pack 1, the time needed by the CM agent in archpro has decreased, thus improving overall performance.

而且据观察，从CM v8.3 fix pack 1开始，archpro中的CM代理所需的时间已经有所减少，因而整体性能得以提高。

2·The report assessed the condition of the reef between 2009 and 2014. It showed that pesticide and pollution have decreased, but not enough to reach environmental targets.

该报告评估了大堡礁2009年到2014年期间的状况。报告显示农药和污染已经有所减少，但是尚未达到环保目标。

3·The report says malaria malaria deaths have decreased in several countries.

报告说道，疟疾死亡在几个国家的都有所减少。

4·A statement noted that while food prices have decreased from their peak last year, they remain high in historical terms.

一份声明说，虽然食品价格已较去年的峰值有所减少，但仍处于历史高点。

5·But the cell number also decreased.

细胞数也有所减少。

(1)on the decrease在减少中

(1)decrease by减少了…