同学你好，该知识点来自沪江网校《新版标日初级上下册精讲连读【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，
a rash of sth
a large number of unpleasant events of the same type
（一下子出现的）大量令人不快的事
There has been a rash of robberies/accidents/complaints in the last two months.
过去两个月中，突然发生很多起抢劫案／一下出了很多起事故／接二连三收到多起投诉。
https://dictionary.cambridge.org/dictionary/english-chinese-simplified/rash

这句表语为all, 是代词做表语，https://dictionary.cambridge.org/dictionary/english-chinese-simplified/all

祝好！