Nearly a billion people are illiterate. 有将近十亿人是文盲。
Such courses, Hacker argues, are a remedy for the numerical illiteracy of adults who have completed high-level math like algebra but are unable to calculate the price of, say, a carpet by area. 成人在数字方面的无知/数字文盲
It was an illiterate letter, full of mistakes. 这封信文笔拙劣，错误连篇。