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

约翰·斯诺想要面对挑战解决这个问题。

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

约翰·斯洛想面对这个挑战，解决这个问题。

3·John Snow wanted to use his knowledge to help solve this problem.

约翰希望利用他的知识来解决这个问题。

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

其次，约翰·斯诺调查了这两条街的水源。

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

接下来，约翰·斯洛调查了这两条街的水源情况。

6·John Snow had shown that cholera was spread by germs and not in a cloud of gas.

约翰·斯诺在此之前就曾经表明，霍乱是由病菌而不是由气团传播的。

7·With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.

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。

8·With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.

有了这个证据，约翰·斯诺就能够肯定的宣布，这种被污染的水携带病毒。

9·With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.

利用这个额外证据，约翰·斯诺就可以很有把握地宣布污染水携带病菌。

10·With this extra evidence John Snow was able to announce with certainty that polluted water carried the virus.

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。