Handling such a large sum of money, we must be extremely careful, as if at the edge of an abyss or on thin ice.
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From the ode 小旻 in the 诗经: 战战兢兢，如临深渊，如履薄冰, 'trembling and wary, as if at the edge of a deep pool, as if treading on thin ice'. The two images still usually come as a pair.
