During negotiations, representatives from both sides were extremely cautious, choosing their words with great care.
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如履薄冰 comes from the Book of Songs (《诗经》), specifically the poem 'Xiao Min' (小旻): 'Trembling and cautious, as if standing on the edge of a cliff, as if walking on thin ice (战战兢兢,如临深渊,如履薄冰).' It has been used for over 2,500 years.