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。
2
In this Community Center, people can gather around the water and relax without visibility of their work site.
在这个社区中心，人们可以尽情地享受水景，完全放松下来，而不用看见他们的田地。
3
The water has some of the best visibilityin the world, and is perfect for snorkeling or diving.