eternal triangle
三角关系，尤指两个人爱上同一个人的情况
文学·指三角恋或情感纠葛
英文释义
a complicated romantic relationship involving three people
例句
The novel explores the eternal triangle of a husband, wife, and her lover.
典故来源
源自19世纪文学，描述三人间复杂情感关系，常见于戏剧和小说中。