根据这个附加的证据，约翰·斯诺可以肯定地宣布是污染的水源传播了病毒。
With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.
有了这个提别的证据，约翰斯诺就能够肯定地宣布，这种被污染了的水携带着病菌。
With this extra evidence, John Snow was able to announce with certainty that polluted water carried the disease.
有了这个额外的证据，约翰·斯诺就能够肯定地宣布这种被污染了的水携带有这种病毒。
With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.
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