[Vocabulary] The difference between 'on one hand' and 'on the one hand'

[Maggiedoudou]

Dear teachers,
Two days ago, I read a composition of one of my classmates recommended by our English teacher for reference. However, I was really confused by such an expression as ‘on one hand’ in her writing while I usually use ‘on the one hand’ in mine.
My dictionary tells me the two phrases share the same meaning: from one point of view. However, my mind is in a fog about the real difference between them. Meanwhile, I find it difficult for me to get any further proper explanations concerned in my reference books.
Therefore, I would like to ask about which one of them is the only correct in English or is preferable to native speakers of English.
I would be very appreciated if you can do me a favor. Thanks a lot.
Yours sincerely,
Maggie

 

[probus]

In my opinion there is no difference.

 

[emsr2d2]

These repetitive posts about "on the one hand" are being closed by moderators. There appears to be an entire English class on the forum at the moment, all of whom are asking the same question without checking to see if any of their classmates have asked it already.