an event or period that is important because it represents a big change in how people do or think about something

The year 1969 was a watershed in her life - she changed her career and remarried. 1969年是她人生的一个转折点——她改了行，也再婚了。

an area of high ground from which water flows down to a river

in Britain, the time in the evening, usually 9 p.m., when television programmes that are not suitable for children may start to be shown