vocabulary 一般用作不可数名词或单数名词。Do not say 不要说 'I can learn new vocabularies from English songs.' Say 而要说 I can learn new vocabulary from English songs.（我可以从英语歌曲中学习新词汇。）（摘自《朗文多功能英汉双解词典》）

同意蒋老师解答！

(1)pronounciation表示具体某个特定单词的发音为可数名词。

Please pay attention to the pronunciations in your presentation.  

请注意你发言中的发音问题.

Which of these three pronunciations is the most usual?  

这三种读法中,哪一种最常用?

These three forms are local pronunciations of this Sanskrit name.  

这个名字的当地梵语发音拥有三种形式.

Neil has trouble with words that have similar pronunciations.  

尼尔分不清楚读音相似的词.

Some pronunciations are hard to distinguish.  

觉得有的发音很接近,很难分辨.

(2)pronounciation表示抽象单词的发音或者某个人的发音为不可数名词。

I thought a phonetic spelling might aid in pronunciation.  

我想语音拼写可能有助于发音。

You're going to have to forgive my pronunciation.  

你得原谅我的发音。

She gave the word its French pronunciation.  

她读出了该词的法语发音。

Please correct my pronunciation.  

请纠正我的发音.

You must amend your pronunciation.  

你必须改正你的发音.

His pronunciation is simply terrible.  

他的发音简直坏透了.

(1)vocabulary表示一种抽象意义的词汇量为不可数名词。

His speech is immature, his vocabulary limited.

他说话很幼稚，使用的词汇有限。

(2)vocabulary表示一种具体的单词的总的数量为可数名词，尤其是不同领域的词汇量。

We read to improve our vocabularies.  

我们阅读以便扩大词汇量。