The literal meaning of "cang hai sang tian" is "the sea has turned into mulberry fields," serving as a metaphor for tremendous changes in the world. This idiom originates from the dialogue between the immortal Ma Gu and Wang Fangping in Ge Hong's Biographies of Immortals from the Jin Dynasty. Ma Gu said she had witnessed the East China Sea turn into mulberry fields three times, which vividly conveys the immense span of time and the enormity of change. It is often used to describe the vicissitudes of the world and the impermanence of life, carrying a sense of the passage of time and awe at its power. In terms of usage, it is mostly employed to describe drastic changes in one's hometown, city, country, or life circumstances, and can also be used to lament the passage of time. Its emotional tone is relatively neutral, but it often carries a sense of lament, nostalgia, or helplessness. Culturally, it reflects ancient Chinese philosophical contemplation on natural cycles and the impermanence of worldly affairs. It is similar to idioms such as "bai yun cang gou" (white clouds change into gray dogs) and "ri xin yue yi" (daily renewal and monthly change), but places greater emphasis on the intensity of change and the vastness of time.
📝 Example
1. Over the decades, this small fishing village has transformed into an international metropolis—what a sea change. (describing a tremendous transformation)
2. Returning to his long-lost hometown and seeing the old house of his childhood replaced by towering skyscrapers, he could not help but sigh at the sea change. (describing the vicissitudes of the world)