约翰·斯诺想要面对挑战解决这个问题。

John Snow wanted to face the challenge and solve this problem.

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其次，约翰·斯诺调查了这两条街的水源。

Next, John Snow looked into the source of the water for these two streets.

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其次，约翰·斯诺调查了这两条街的水源。

Next, John Snow looked into the source of the water for these two streets.

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