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。

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

youdao

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。

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

youdao