"an increasing number of" 是一个固定短语，表示“越来越多的”。其用法如下：
后面接可数名词复数形式，例如：
An increasing number of people are choosing to work from home.
There has been an increasing number of accidents on this road.
后面接不可数名词形式，例如：
There is an increasing number of pollution in our cities.
An increasing number of research shows that exercise is good for our health.
需要注意的是，在正式写作中，"an increasing number of" 不宜过多地出现，可以使用一些同义替换的表达方式，例如：more and more，a growing number of等。
