translation.en: If we know that we're going to get extra bang for the buck from providing clean water, then I think that we can say, let's push the effort into that aspect of the control, so that we can actually solve the problem, even though, if you just look at the frequency of infection, you would suggest that you can't solve the problem well enough just by cleaning up water supply.
translation.zh: 如果我们知道我们将会从提供清洁的水源中获得额外的好处， 那么我想，我们会说， 让我们努力推进这方面的控制， 以便我们能真正的解决这个问题， 即使这样，如果你仅仅是看看这些感染的频率， 你可能会觉得这个问题无法仅仅通过清理水源供应 就可以很好的解决。