This is our favorite subject. This is our favorite subject of conversation.什么意思

问题描述:

This is our favorite subject. This is our favorite subject of conversation.什么意思
This is our favorite subject.
This is our favorite subject of conversation.
这两句有什么不同的意思?分别怎样解释

这是我们最喜欢的科目.这是我们最喜欢的谈话主题