这是表示比例的比较,意思是越……就越……。第一个the more 也可以看成是一个条件。
The more you read, the better you understand.
你看的书越多,你懂得就越多。(= If you read more, you will understand better.)
The busier he is, the happier he feels.
The more difficult the questions are, the less likely I am to be able to answer them.