1. the（an） increase in A；含义是：A本身有增加。但并没有表达到底增加了多少。如：
There has been a slight increase in the consumption of meat
肉类消费量略有增长。
There has been a marked increase in crimes against property
侵财案件明显增加了。
Motor traders are looking forward to a further increase in vehicle sales.
汽车经销商预期汽车销量会进一步攀升。
One of the by-products of unemployment is an increase in crime.
失业带来的一大恶果是犯罪率上升。
The rise in unemployment is paralleled by an increase in petty crime.
在失业率上升的同时，轻度犯罪也跟着增长。
An increase in cars has resulted in the decline of public transport.
汽车的增加导致了公共交通的减少。
The increase in crime is a sad reflection on our society today.
犯罪的增加令人遗憾地反映了当今社会不太好的一面。
The sharp increase in crime seems to buttress the argument for more police officers on the street.
犯罪率急剧上升似乎肯定了街上增加巡警的论点。
There will be an increase in the range of 0 to 3 per cent.
将会有0到3个百分点的增长幅度。
There was an astounding 20% increase in sales.
销售量惊人地增加了20%。
The discovery of the bomb prompted an increase in security.
此次发现炸弹促使当局加强了安全工作。
Security is being stepped up to deal with the increase in violence
正在加强安保工作以应对日益增多的暴力活动。
An increase in crime could kill the golden goose of tourism.
犯罪率的上升可能会扼杀旅游业这只产金蛋的鹅。
The increase in racial tension constitutes a threat to our society.
种族间紧张状态的升级是对我们社会的一种威胁。
There has been a sharp increase in vehicle excise.
机动车消费税剧增。
They may have to widen the road to cope with the increase in traffic.
他们可能得拓宽这条道路以适应车辆的增多。
This increase in exports bears testimony to the successes of industry.
出口增长证明了产业的成功。
We are now witnessing an unprecedented increase in violent crime.
我们现在看到暴力犯罪空前增多。
The increase in the price of oil had a knock-on effect on the cost of many other goods.
石油价格上涨对其他许多商品的价格引起了连锁反应。
If costs go up, there will be a pro rata increase in prices.
如果成本增加，价格就会相应上涨。
Internet multiplayer games are responsible for much of the increase in broadband use.
网络多人游戏是宽带用户增多的一个主要原因。
Cultures that were better at trading saw a concomitant increase in their wealth
比较擅长贸易的文明其财富也随之增长。
This policy has led to a dramatic increase in our prison populations.
这项政策已经让我们监狱的囚犯人数激增。
2. the（an） increase of A;增大值为A。
an increase of 3% p.a.
每年3%的增长
He called for an increase of 1p on income tax.
他呼吁所得税提高1便士。
These figures show an increase of over one million in unemployment
这些数据表明失业人数增加了100多万。
The registration of the university shows an increase of 10 percent over last year.
这所大学的注册人数比去年递增了10%。
His weight showed an increase of 3 Ibs. In a month.
他的体重表面他一个月内增加了3 磅重量。
In 2023 a further increase of 9% per cent had taken place.
2023年又增加了9%.
Only three new sites were built in this city due to a decrease in business and an increase in prices.
由于生意减少和价格上涨，这个城市只新建了三个网点。
与increase相对应的词decrease用法也适合上述语法规则。
There has been some decrease in military spending this year.
今年的军费开支有所减少。
There has been a decrease in traffic accidents.
交通事故减少了。
There has been a progressive decrease in population every year in this city.
这个城市的人口在逐年递减。
A combination of factors may be responsible for the decrease in car sales.
多种因素的综合作用可能导致了汽车销量的下降。
Last year there was a 20% decrease in his earnings.
去年他的收入减少了20%。
Bank base rates have fallen from 10 per cent to 6 per cent — a decrease of 40 per cent.
银行的基本利率已从10%降到了6%，降幅高达40%。