Do you need a half-width space after the quotation marks in the English abstract format of the paper?
No need. No matter what words or sentences are quoted in English papers, the first quotation mark is not added. If the whole sentence ends after the second quotation mark, it should be a quotation mark with a period and then a space, and then the next sentence, so there is no need to add a half-width space after the quotation mark in the English abstract format of the paper.