Beautiful and happy unions or good times are often short-lived and easily come to an end, especially referring to a perfect marriage that is easily broken.
他们曾经是一对令人羡慕的璧人，可惜彩云易散，最终还是分道扬镳了。
They were once an enviable couple, but unfortunately, beautiful things are transient, and they eventually went their separate ways.
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