watershed

音标发音

The pindus mountains form the watershed between rivers flowing to the Aegean Sea and to the Ionian Sea.
品都斯山脉构成了流向爱琴海和爱奥尼亚海的河流的分水岭。

(BIG CHANGE) an event or period that is important because it represents a big change in how people do or think about something
(HIGH GROUND) an area of high ground from which water flows down to a river
(TELEVISION) 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

If something such as an event is a watershed in the history or development of something, it is very important because it represents the beginning of a new stage in it.