Many voters were still undecided in the days leading up to [=approaching] the election.很多选民在选举的前几天仍然犹豫不决。

There was a series of errors leading up to the accident.一系列的失误导致了这次事故的发生。

a chapter leading up to the main topic of the book引出全书主题的导读章节

I had no idea what he was leading up to when he started talking about his father.当他开始谈论他的父亲时，我不知道他究竟要说什么。