Could you give an example of an input that has multiple printed output lines. Typically an Input cell will only generate a single Output cell unless more than one of the commands in the Input Cell are not terminated by a semicolon.

Thank you for your answer, Mr.Reiss.

What you said was very curious and I am now trying to understand that. It is helpful. :)

And additionally, however, What I exactly wanna do is deleting just one line of last printed output, not the whole output cell.

I think, considering its powerful system, wolfram language definitely can do that. Would you look for that matter with me?

Thank you.(I am not a native English speaker so my expression could cause some misunderstanding.)