a名词of后面一般接名词，代词或动名词。of是介词，意思是关于；属于；…的；由…组成的。
例句
1、Would you say what you felt was a feeling of betrayal?
你是否觉得有一种被人出卖的感觉？
2、A flock of birds flew towards us slowly from far away.
一群鸟儿从远处朝我们缓缓飞来。
3、We could all do with a cup of tea.
要是能给我们都来杯茶就好了。
