The crackling became louder and louder.是什么意思？

The crackling became louder and louder.

爆裂声变得越来越响.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

crackling

n. 轻微的爆裂声，噼啪声，（烤猪肉的）脆皮；v. 发出轻微的爆裂声，发出噼啪声( crackle的现在分词 )；

例句
...a crackling fire.
噼啪作响的炉火

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

louder

loud（响亮的，大声的，高声的）的比较级形式；

例句
As we got close to Broadway, we heard the sounds of revelry getting louder and louder.
我们接近百老汇时，听到人们饮酒狂欢的声音越来越大。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。