【环球英语】阳光净化水 (7)

英语自学网

HINTS:
        colour
        ultraviolet
        protozoa
        Pastor Moses Kwanga
        He says 'The technology …… this system'.
        roofing
The sun heats the water. The roof at the top of the house is painted black. This helps to speed up the heating process. The colour black takes in the heat from the sun. The ultraviolet rays and the heat from the sun act together on the water. The bacteria and protozoa in the water are destroyed within eight hours. No fuel has burned. But the water is safe to drink. Pastor Moses Kwanga from the local church supports the project. He says 'The technology is very easy. But until now people did not know about it. We can use old pieces of black roofing to put the bottles on. The bottles are also easy to find. We can use them again and again. It does not cost a lot of money. Everyone can have clean drinking water with this system'.