a pleasant conversation的用法和样例：
- We spent many hours in a pleasant conversation.
- I had/held a pleasant conversation with him.
- We were enjoying a pleasant conversation, until she sailed in with her unpleasant remarks.
我们正在愉快地交谈, 她却起劲地加了进来, 说些没人爱听的话。
- The house has a pleasant outlook over the valley.
- They wished us a pleasant journey.
- It gives forth a pleasant fragrance.