/ˈwɔː.tə.ʃed/
an event or period that is important because it represents a big change in how people do or think about something
(标志重大变化的)转折点，分界线，分水岭
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。
I knew that this result could be possibly a watershed moment for physicists.
我知道这一结果可能是物理学家的分水岭。
