an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations"
独特なことの印となる出来事、重要で歴史的な方向転換、または、重要な発展がかかっていること
landmark
a mark showing the boundary of a piece of land
土地の境界を示すしるし
landmark
an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken