It goes on to define public welfare to include "effects on soils, water, crops, vegetation, manmade materials, animals, wildlife, weather, visibility, and climate".

而且这个法案还定义了公众幸福感，包括对于土壤，水，农作物，植被，人造材料，动物，野生生物，天气，空气可见度和气候的影响。

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Researchers thought some freshwater species might rely on sound because of poor visibility. So they collected water boatmen from a stream and pond in France.

研究者认为由于淡水中能见度低，动物可能会更多的依靠声音。

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The water is blue and warm, the visibility is perfect.

海水蔚蓝而温暖，能见度恰到好处。

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"The warmth of the water and the visibility is incredible, so you can see the whole ship from the surface, " says Easterbrook.

CNN: A worthy wreck for divers: USS Kittiwake

Eco enthusiasts can get their Jacques Cousteau on at Las Baulas National Marine Park, an underwater showcase of marine life with warm water, high visibility and gentle currents.

BBC: Daily deal: Scuba diving in Bonaire

The shallow water and remarkable visibility in the seas surrounding Bermuda make diving here an unforgettably vivid experience: a typical dive allows plenty of time to explore the coral encrusted hulls, barnacled cannons and holds populated with a kaleidoscopic array of parrot fish, barracuda and angel fish.

BBC: Wreck diving in Bermuda