Continuity of water supply is taken for granted in most developed countries, but is a severe problem in many developing countries, where sometimes water is only provided for a few hours every day or a few days a week.
在大部分发达国家，持续供水是理所当然的事情，但在许多发展中国家，这仍是一个严重的问题，有时只能保证每天几小时甚至每周数天的供水。