Studies on "Multi-character Literal" and "String Literal" are done, and my ignorance, noticed and criticized by @TheMemberFormerlyKnownAsAWOL, on multi-character liteal has been converted into knowledge.
Thank you so much!
By the by: In British English, is it the double quotes or the single quotes that is used to enclose a piece of speech or a title? For example: "Hyde Park" or 'Hyde Park'.