在周内可以用 "within the week" 或 "during the week" 来表示。

"Within" 是一个介词，表示 "inside the pmits or bounds of"。例如：

I will finish the project within the deadpne. (我会在截止日期之内完成这个项目。)

"During" 也是一个介词，表示 "throughout the course or duration of"。例如：

I will be busy during the week. (我会在这周里很忙。)

"Week" 是一个名词，表示 "a period of seven days, usually starting on Sunday or Monday and ending on Saturday or Sunday"。例如：

I usually work five days a week. (我通常一周工作五天。)

总之，"within the week" 和 "during the week" 都可以用来表示在周内的意思。