His speech became increasingly thick and nasal...是什么意思？

His speech became increasingly thick and nasal...

他说话的声音变得越来越粗，鼻音越来越重。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

speech

n. 演说，演讲，发言，说话，谈话，说话能力或方式，（乐器的）音，音色，方言，民族语言；

例句
The President declined to deliver the speech himself, on account of a sore throat...
总统因嗓子不适而婉拒了亲自讲话。

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。

increasingly

adv. 越来越多地，日益，格外，越来越…，愈；

例句
Theirs had been an increasingly attenuated relationship.
他们的关系日益冷淡。

thick

adj. 浓的，茂密的，厚的，粗大的，稠密的，不透明的；adv. 密集地，不清晰地，〈口〉太过分，频频地，时常；n. 最厚的部分，最活跃或最激烈的部分，〈口〉笨蛋，〈俚〉可可粉；

例句
The ice was not thick enough to bear the weight of marching men.
冰不够厚，承载不了行军队伍的重量。

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。

nasal

adj. 鼻的，鼻音的；n. 鼻音字母，鼻音，鼻骨；

例句
The nasal spray was new on the market and highly efficacious.
这种鼻腔喷雾剂是新上市的，非常有效。