This is a tough question. I have never heard about it, nor have I ever read about it

2. Give me a few seconds for me to search every piece of information in my head now.

3. It is an abstract question. I know little about it.

4. Are you asking me something about+你重复一下句子中的重要词…?

5. Have I given enough information? It would be great if you could give me more.

6. Am I making myself clear?

7. Now you want me to talk about it. But I don't have too much to say.

8. Give me a few seconds for me to organize my thought a little bit。