英語(yǔ)翻譯
Human beings need to drink for their survival．Water ranks __high__on the list of all-time safe fluids．But not all water is as safe as once __thought__．Recent tests of water fountains in several U．S．cities show that many fountains give water containing large __amounts__of lead（Pb）,a poisonous metal．A recent study of 900 water fountains in Los Angeles _revealed___that half of the fountains __tested__contained higher amounts of lead than the _amount___the experts
consider __safe__．In other cities __similar__results of tests were announced：too much lead in many,though ___not all_,drinking fountains． Water doesn‘t normally contain any lead,but when it passes through pipes,it can __be contaminated__． People who drink the water __take in__the lead． An adult‘s body passes most of the lead__out of__the body,but children‘s __body__retains more than half the lead __swallowed__．This makes children more likely to be affected．Lead
can damage the kidneys ,cause __hearing loss__and impair learning and memory ．a(chǎn)s many as____four million children in U．S．A．a(chǎn)lready have high levels of lead in their bodies． Most of this lead comes from __breathing air__polluted with the metal．They can _pick___it up from eating dirt or paint chips containing lead．In __an attempt__to limit the lead in water fountains,officials recently suggested that fountains __found__to have too much lead be replaced or repaired．And that certainly requires a lot of money