“一次的”的英语？

基德斯克普负责组织每月一次的教师研讨班。Kidscape runs monthly work-shops for teachers.提前发出的洪水水位上涨警报防止了又一次的重大灾害。Early warnings of rising water levels prevented another major catastrophe.这一次的研究太零散，难以发挥重大的作用。The research is too unfocused to ha...