十九世纪时人们还没有对饮水质量采取控制措施，传染病是死亡的主要原因。

In the 19th century, when there were no controls on the quality of drinking water, infectious disease was a major cause of death.

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受污染的水和食物是霍乱的传染媒介。官员预计，霍乱将很快在全国范围内传染，因为海地卫生条件很差，并缺乏清洁饮水。

Cholera is spread through contaminated water and food, and officials had predicted it would move around the country quickly because sanitation is poor and clean water is lacking.

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事实上，借由提供人民疫苗接种、干净的饮水、基本的医疗服务以及充份的营养，许多国家已经降低了传染病的威胁，并增进了国民的健康。

In fact, many nations have lessened the impact of infectious disease and improved the health of their people by providing access to vaccines, clean water, basic medical services and good nutrition.

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