reduce
单词辨析：
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。
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。
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。
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。
相关例句：
All the buildings in the town have been reduced to rubble
城里所有的建筑都成了废墟。
They are the descendants of emperors and kings and are now living in reduced circumstances.
他们是帝王的后代，但是现在境况大不如前了。
The pistons are graphite-coated to reduce friction.
活塞上涂了一层石墨以减小摩擦力。
Oil is put in machinery to reduce the friction.
把油涂到机器上减少摩擦。
They are pressing the Chancellor to reduce excise duty on beer.
他们正给总理施压，要求降低啤酒的消费税。
Simmer until mixture reduces.
用小火煮到汤汁收浓。