塔塔化工厂制作了一款不耗电的过滤器，它可以提供一个五口之家一月的清洁饮用水，却只需30卢布（约合0.65美元）。

Tata Chemicals makes a filter that requires no power and can give a family of five safe drinking water for a month for 30 rupees ($0.65).

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“他们称它为清洁煤，因为他们使用了一些过滤器，但实际上是胡说八道，”无煤公民团体的默尔扎·马尔齐奥利说，该组织位于附近古国伊特·鲁里亚的塔奎尼亚镇。

"They call it clean coal because they use some filters, but it is really nonsense," said Marza Marzioli of the no coal citizens group in the nearby ancient Etruscan town of Tarquinia.

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液压系统中过滤器作用是维持流体的清洁度。

T he function of filters in a hydraulic system is to maintain fluid cleanliness.

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