noun
seven wonders (of a particular area)
Refers to a set of seven remarkable or mysterious things in a specific region, school, or context. Often used in phrases like 世界の七不思議 (Seven Wonders of the World) or 学校の七不思議 (seven mysteries of a school).
See also: 世界の七不思議
世界の七不思議について調べています。
I'm researching the Seven Wonders of the World.
Apparently this school has seven mysteries.
noun
total mystery; enigma; conundrum
Jocular or humorous use; describes something completely baffling or inexplicable, as if it were one of the seven wonders. Often used in phrases like 七不思議だ or 七不思議の一つ.
彼がどうやってあのテストに合格したのか、まったく七不思議だ。
How he passed that test is a total mystery.
この機械が動く仕組みは七不思議の一つだよ。
The way this machine works is one of life's great enigmas.