decrease/diminish/lessen/reduce.导航词义：减少，降低

1. decrease:v. （使）减少，（使）变小.指变少或降低水平。

The local government has adopted effective measures to decrease unemployment.

当地政府已经采取有效措施减少失业人数。

Her temperature decreased.

她的体温下降了。

2. diminish:v. （使）减小，（使）降低.指大小、数量不断减小，也可引申为贬低某事物的重要性或价值。

The company planned to diminish the cost of production.

公司计划减少生产成本。

Water in the pond gradually diminished due to lack of rainfall.

由于缺少降雨，池塘里的水逐渐减少。

His comments were only said to diminish the importance of her discoveries.

他的评论就是为了贬低她的发现的重要性。

3. lessen:v. （使）变小，（使）减少.指程度、规模等减少，也可指降低某事物的可能性、影响等。

Her anxiety lessened while listening to the music.

听音乐的时候，她的焦虑减轻了。

Exercise lessens the risk of heart disease.

进行锻炼可降低患心脏病的风险。

The program has lessened the effects of car pollution.

该计划降低了汽车污染的影响。

4. reduce:v. 减少，减小.指降低价格、数量、规模等。

We should take measures to reduce the price.

我们应该采取各种措施来降低物价。

A plan to reduce crime was announced recently.

最近宣布了一项降低犯罪率的计划。

全部

1·People should decrease the amount of fat they eat.

人们应减少脂肪的摄入量。《牛津词典》

2·It will sharply decrease work efficiency.

这会大幅降低工作效率。

3·There has been a decrease in traffic accidents.

交通事故减少了。《新英汉大辞典》

4·Last year there was a 20% decrease in his earnings.

去年他的收入减少了20%。《新英汉大辞典》

5·The money tourists spend helps decrease our chronic trade deficit.

游客的消费有助于减少我们长期的贸易赤字。

6·The number of poor men is on the decrease as the economy is growing.

随着经济发展，贫困人口数量正在减少。

7·There could be a slight decrease in his weight but he eats too much.

他的体重可能略有下降，但他还是吃很多。

8·A decrease in face-to-face social contact can precipitate depression.

面对面社交接触的减少会导致抑郁。

9·Once they get there, their body temperatures decrease very, very quickly.

一旦他们到了那里，他们的体温会下降得非常非常快。

10·The team is looking for other materials to decrease coil size and boost efficiency.

该团队正在寻找其他材料，以减少线圈尺寸和提高效率。

减少

1·People should decrease the amount of fat they eat.

人们应减少脂肪的摄入量。《牛津词典》

2·There has been a decrease in traffic accidents.

交通事故减少了。《新英汉大辞典》

3·Last year there was a 20% decrease in his earnings.

去年他的收入减少了20%。《新英汉大辞典》

4·The money tourists spend helps decrease our chronic trade deficit.

游客的消费有助于减少我们长期的贸易赤字。

5·The number of poor men is on the decrease as the economy is growing.

随着经济发展，贫困人口数量正在减少。

降低

1·It will sharply decrease work efficiency.

这会大幅降低工作效率。

2·I read a study that showed how light can give milk a funny flavor and decrease its nutritional value.

我曾读过一项研究，这项研究表明光会使牛奶有一种奇怪的味道，并降低它的营养价值。

3·Is it possible to decrease inflation without causing a recession and its concomitant increase line in unemployment?

有没有可能在不引发衰退及其伴随而来的失业率上升的情况下降低通胀？

4·By using corn ethanol instead, the cost of gas will decrease because now the import taxes on fossil fuels are calculated into the price.

通过使用玉米乙醇作为替代，汽油的成本将会降低，因为现在化石燃料的进口税已经计算在价格中了。

5·This decrease in cost allows researchers, hobbyists and even elementary school groups to put simple instruments into LEO or even having them deployed from the ISS.

成本的降低使得研究人员、业余爱好者甚至小学生能够将简单的仪器放入近地轨道，甚至可以由国际空间站对它们进行部署。

减小

1·The team is looking at other materials to decrease coil size and boost efficiency.

小组正在研究其他材料，来减小线圈的尺寸和提高效率。

2·But as the tsunami propagates into the really deep water of the Pacific Basin, [the shallower origin] does decrease its amplitude somewhat.

但是当海啸传播至太平洋盆地真正的深水区域时，由于海啸发源地海水较浅，这确实稍稍减小了它的振幅。

3·Wrapping causes the expected screen space for the components on each TAB to decrease.

换行导致每个选项卡上的组件期望的屏幕空间减小。

4·Each increment of length brings a further saving, but the sizes of such benefits decrease with increasing neck length.

长度越长，越能节省能量，但节省的能量大小却是随着脖子长度的增长而减小的。

5·And now, if I keep rotating, then the slope will decrease again.

现在如果我一直转，那么斜率又会减小。

(1)on the decrease在减少中

(1)decrease by减少了…