more and more people are doing sth

问题描述:

more and more people are doing sth
如题, more and more people are doing,这里be doing是什么意思呢?
是不是,只要表达越来越多的人做某事的时候就会用到这个句型,后面接be doing啊?

原句是“越来越多的人正在做某事”,be doing强调的是“正在做”,一个趋势或者潮流.譬如:现在越来越多的人在加入我们的话题讨论.(Now more and more people are joining our discussion.)