His delivery was stilted and occasionally stumbling.是什么意思？

His delivery was stilted and occasionally stumbling.

他的发言很生硬，有时还打结巴。

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。

delivery

n. 传送，投递，[法]（正式）交付，分娩，讲演；

例句
The doctor worked busily beneath the blinding lights of the delivery room.
这位医生在产房刺目的灯光下忙碌着。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

stilted

adj. （动作或言语）生硬的，不自然的；

例句
We made polite, stilted conversation...
我们客套了一番。

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。

occasionally

adv. 偶尔，偶然，有时候；

例句
There have now been well authenticated reports that the use of this drug is very occasionally responsible for heart attacks.
现在已有非常可靠的报告证明该药物偶可引发心脏病。

stumbling

adj. 摇摇晃晃或跌跌撞撞的；v. （不顺畅地）说( stumble的现在分词 )，跌跌撞撞地走，绊脚，（说话、演奏等）出错；

例句
His stumbling attempts at colloquial Russian amused her.
他结结巴巴地学说俄语，把她逗乐了。