沒聽過外籍老師說過Give me the report in a week.無法回答。in: at the end of a period of time.所以精確地說,in a week= at the end of a week。中文沒有完全對等的字眼。in a week不一定是指一周以後。I'll be there in a week.=I'll be there at the end of a week.大約第5/6/7天到那裏都算。within a week是一週之內,一兩天也算是一週之內。