5 billion lack adequate sanitation services.

25亿人缺乏适当环卫服务。

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And more than a third of the world lacks adequate sanitation services.

并且，全世界超过三分之一的地区缺乏足够的医疗设施服务。

youdao

Nearly half the world's population do not have access to adequate sanitation.

全球人口中约一半生活在卫生条件不达标的环境中。

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Few towns had clean drinking water or adequate sanitation.

CNN: SPECIAL REPORT: HEALTH

The World Water Council, founded in 1996 to promote awareness, build political commitment and trigger action on critical water issues, notes on its website that more than one out of six people (1.1 billion) in the world already lack access to safe drinking water, and that more than two out of six people (2.6 billion) lack adequate sanitation.

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