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用茶杯饮骆驼
A drop in the ocean
His small donation was just a drop in the ocean.
他那点微薄的捐款简直是用茶杯饮骆驼。
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用刺锥牛
田牛
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用水煮石头 A futile effort 用秕糠垒水坝 Built on sand 用刺锥牛 A flea biting an elephant