Police continue to confront youths armed with rocks on a weekly basis.

VOA: standard.2009.04.08

And on the other, a table, which held loaves of bread that were changed on a weekly basis.

另一边是一张桌子，用来摆放长面包,面包一周替换一次。

耶鲁公开课 - 旧约导论课程节选

And that's what these will be for on a weekly basis for each of the remaining problem sets.

这就是为那些每周剩余的习题集,而打好基础的。

哈佛公开课 - 计算机科学课程节选