The equipment doesn't necessarily operate in pure water.

该设备不一定要在纯净水中使用。

youdao

Even the nice fresh pure spring water, birds and fish poop in it.

即使是新鲜纯净的好泉水，鸟和鱼也在里面排便。

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Hydroponics is not planting them in pure water, in water that has the proper mix of nutrients.

水培法不是把它们种植在纯净水里，而是在适当混合了营养素的水中。

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An international service project called Pure Water for All helps support the work.

VOA: special.2009.06.22

"We have found a habitable environment which is so benign and supportive of life that if you had been on the planet, the water would have been pure enough to drink, " said planetary scientist John Grotzinger, at the California Institute of Technology, who is the mission's project scientist.

WSJ: Scientists Say Microbial Life Was Possible on Mars

What brings me back is a collection of specifically New England sensations that I associate with the place: free-wheeling a bicycle down a sandy beach road, the tang of lemon on fried clams, the clear green water of the north Atlantic and the pure maritime light.

BBC: Cast away: five island paradises

What happened to the poisoned water from all those pure wells?

NEWYORKER: God Squad