To be a lone luan or phoenix; to be a solitary figure after the loss or separation from one's beloved spouse or partner; to be left alone and desolate.
他们曾经是那么恩爱的一对，如今却鸾只凤单，令人唏嘘
They were once such a loving couple, but now they are a lone luan and phoenix, which is truly regrettable.
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