1. 转折点;分水岭
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.

2. (成人电视节目播出前的)分水岭时间
The watershed is a time before which television broadcasters have agreed not to show programmes unsuitable for children, for example programmes that contain scenes of sex or violence.

3. 分水线；分水岭
A watershed is an area of high ground which divides two or more river systems, so that all streams on one side flow into one river and those on the other side flow into a different river.

1. an event marking a unique or important historical change of course or one on which important developments depend

e.g. the agreement was a watershed in the history of both nations

Synonym: landmarkturning point

2. the entire geographical area drained by a river and its tributaries
an area characterized by all runoff being conveyed to the same outlet

e.g. flood control in the Missouri basin

Synonym: river basinbasindrainage basincatchment areacatchment basindrainage area

3. a ridge of land that separates two adjacent river systems

Synonym: water partingdivide