BONNIE TAYLOR-BLAKE: "I should back up just for a second, though, and explain that he's in good company, because a lot of Americans were unfamiliar with the term Black Friday until about a decade ago. Its more modern application is in regard to profitability for the day. So a lot of people think that the black in Black Friday refers to ledger books going from negative values, which would be in the red, into positive values, which is into the black."
BONNIE TAYLOR BLAKE回答前先说的那些(红字标注的),是什么意思呀?