Decrease和reduce有什么区别？

reduce是一种主观的减少、降低，主语是使减少的外力，to make something smaller or less in size, amount, or price。
decrease是一种客观的减少、下降，主语是减少的东西（size, amount, or price etc.）,to go down to a lower level, or to make something do this。

拓展资料

 decrease

1、verb

~ (from sth) (to sth)

（使大小、数量等）减少，减小，降低 
to become or make sth become smaller in size, number, etc.

[V] The number of new students decreased from 210 to 160 this year.

今年新生人数从210减少到160。

The price of wheat has decreased by 15%.

小麦价格降低了15%。

This species of bird is decreasing in numbers every year.

这种鸟的数量在逐年减少。

a decreasing population

逐渐减少的人口

[VN] People should decrease the amount of fat they eat.

人们应减少脂肪的摄入量。

反义词： increase

2、noun

[C, U] ~ (in sth) | ~ (of sth)

减少；降低；减少量 
the process of reducing sth or the amount that sth is reduced by

同义词： reduction

There has been some decrease in military spending this year.

今年的军费开支有所减少。

a decrease of nearly 6% in the number of visitors to the museum

参观博物馆人数下降将近6%。、

reduce

1、verb

[VN] ~ sth (from sth) (to sth) | ~ sth (by sth)

减少，缩小（尺寸、数量、价格等） 
to make sth less or smaller in size, quantity, price, etc.

Reduce speed now (= on a sign) .

减速行驶。

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

过去一年，各项费用已经减少了20%。

Giving up smoking reduces the risk of heart disease.

戒烟会减少得心脏病的风险。

The number of employees was reduced from 40 to 25.

雇员人数从40人减少到了25人。

The skirt was reduced to £10 in the sale.

在大减价期间，这条裙子减价到10英镑。

2、[VN , V] （使）蒸发 

if you reduce a liquid or a liquid reduces , you boil it so that it becomes less in quantity。

to lose weight by limiting the amount and type of food that you eat.

a reducing plan

节食计划

4、[VN] (chemistry 化) 使还原 

to add one or more electrons to a substance or to remove oxygen from a substance

compare oxidize.

这一组动词都有“减少，减轻”的意思。 alleviate, diminish, reduce, decrease, decline 这一组动词都有“减少，减轻”的意思。 alleviate v.在痛苦方面的减轻，缓和 The painkiller alleviated the pain.止疼药减缓了疼痛。 diminish v.指因为不断消耗，在数量方面缓慢减少，也指在素质或者价值的下降。 The supply of oil has diminished because of the war.由于战争石油的供应减少了。 reduce v.指人为地使某物在数量或重量方面的减少或降低。 He reduced the amount of money they could spend.他缩减了他们的开销。 decrease v.指数量上的减少；力量或者强度的减弱。 The population decreased a lot last year.去年人口数量急剧下降。 decline v. (数目、价格、比率)下降；谢绝，婉言推辞；衰退，衰落。 Last year, the crime rate in Chicago has sharply declined.去年芝加哥的犯罪率明显下降。