Check, maintain and clean the diesel-engine generator sets, compressor, oil and water supply equipment, etc. and keep them in work condition.

检查、维保和清洁柴油发电机组、压缩机、供水供油设备，保证其良好的工作状况。

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This should be placed on the supply to the entire house in order to maintain equal hot and cold water pressures.

为了保持相同的热水和冷水压力，这个装置应该安装在整个室内住宅的供水管道上。

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Looking to reduce their costs and maintain access to supply, oil and gas producers have been investing in water conservation and recycling efforts, the Wall Street Journal reported last year.

去年华尔街日报曾报道，油气生产商为了降低成本、维持油气供应量，在水资源保护和废水循环利用方面投入了许多金钱和精力。

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The creatures have engineered the rings to maintain a supply of water in their environment, he tells Science magazine.

BBC: Termites 'engineer fairy circles'

In most of France, for instance, private franchise-holders supply the water but local authorities maintain the pipes a solution which, if applied to Britain's railways, would have the government owning carriages and engines but not running trains.

ECONOMIST: After privatising