Gèguó yīng hézuò yìngduì yìqíng, ér bùshì yǐlín-wéihè.
Countries should cooperate to handle the epidemic, not shift the burden to neighbors.
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From 《孟子·告子下》 (Mencius): Mencius contrasts the sage-king Yu - who directed floods to the sea - with his contemporary Bai Gui, who diverted floods into neighboring states. 'Using one's neighbor as a ditch' (以邻国为壑) became a reproach against selfish statecraft.
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Formal; frequent in diplomatic and economic commentary. English 'beggar-thy-neighbor' is a close match.