"The tears of the two sleeves are dry" means that the tears of homesickness can't be wiped away, so that both sleeves are wet, but the tears just can't stop.
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Appreciate:
The language of this poem is simple and natural, full of rich frontier life flavor, with both life interest and humanistic feelings, fresh and lively, with profound aftertaste, and sincere feelings. Poets are good at refining and summarizing the thoughts and words of many people by artistic means, making them typical.