Shī lǐ de yànláikè, xiě de zhèngshì zhè zhǒng piāobó xīnjìng.
The 'wild-goose guest' in the poem captures exactly that drifting, rootless mood.
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Literary image: wild geese (雁) in classical poetry symbolize travelers and letters from far away. A 雁来客 is a guest who arrives like a migrating bird and may not stay long. Used in poetry and nostalgic prose.