美国有线新闻 CNN 水中何种元素引发癌症?

Could an element commonly found in Americans` tap water caused cancer? A nonprofit environmental group is sounding the alarm about something called chromium-6. The U.S. government says high levels of it in the air can be carcinogenic, meaning they can cause cancer. But it`s not known yet if or how much chromium-6 in drinking water could be harmful.

一种常见于美国自来水中的元素引发癌症吗?一个非营利环保组织对此元素chromium-6敲响了警钟。美国政府表示空气中高浓度的此元素可导致癌症。但是，尚不清楚，在引用水中，chromium-6的致害浓度。

Still, the Environmental Working Group, an organization that says it`s dedicated<sup>1</sup> to protecting human health, found chromium-6 in almost 90 percent of the water systems at sample across the U.S. It`s bringing additional scrutiny² to the U.S. water supply following the recent discovery of high levels of lead in the water of Flint, Michigan.

环境工作组织，旨在保护人类健康。此组织发现，在美国收集的饮用水样本中，90%存在chromium-6。由于近期美国密歇根州弗林特市饮用水中铅含量超标，因此加美国供水系统加大了审查力度。

SUBTITLE³: What is chromium-6?

chromium-6是什么?

Chromium-6 is a heavy metal and a carcinogen. It`s rarely found in nature. Instead, it`s created by various industrial processes.

chromium-6是一种重金属，同时也是一种致癌物质。自然界中很少存在，而主要于各种工业过程中产生。

SUBTITLE: It`s created by various industrial processes such as welding. And also used in many manufacturing processes, like tanning leather and producing stainless⁴ steel.

字幕：它产生于焊接等各种工业过程。也用于许多生产过程,如鞣制皮革和生产不锈钢。

There are reports that chromium-6 is in the drinking water of hundreds of millions of Americans. However, health authorities don`t know exactly what level of chromium-6 might pose heath problems. They do know that when they put chromium in the drinking water of rats and mice, that that level of chromium caused cancer.

据报道，数百万美国公民的饮用水中，都存在chromium-6。但是官方尚不清楚，chromium-6对人类构成健康威胁的含量水平。也不知道何时在老鼠的饮用水中，添加了导致其癌症的chromium-6的含量。

Scientists who study chromium-6 say they`re concerned about even very low levels of exposure to chromium-6 when it`s a child or an infant or developing fetus⁵.

研究chromium-6的科学家担心，即使chromium-6含量很低，也会影响儿童、婴儿或胎儿的健康发育。

1 dedicated   

adj.一心一意的；献身的；热诚的

参考例句：

• He dedicated his life to the cause of education.他献身于教育事业。
• His whole energies are dedicated to improve the design.他的全部精力都放在改进这项设计上了。

2 scrutiny   

n.详细检查，仔细观察

参考例句：

• His work looks all right,but it will not bear scrutiny.他的工作似乎很好，但是经不起仔细检查。
• Few wives in their forties can weather such a scrutiny.很少年过四十的妻子经得起这么仔细的观察。

3 subtitle   

n.副题（书本中的），说明对白的字幕

参考例句：

• His new book has a subtitle.他的新书有一个副标题。
• Ah!I don't know why they don't subtitle these movies.唉！我不知道这些电影为什么不打字幕。

4 stainless   

adj.无瑕疵的，不锈的

参考例句：

• I have a set of stainless knives and forks.我有一套不锈钢刀叉。
• Before the recent political scandal,her reputation had been stainless.在最近的政治丑闻之前，她的名声是无懈可击的。

5 fetus   

n.胎，胎儿

参考例句：

• In the fetus,blood cells are formed in different sites at different ages.胎儿的血细胞在不同时期生成在不同的部位。
• No one knows why a fetus is not automatically rejected by the mother's immune system. 没有人知道为什么母亲的免疫系统不会自动排斥胎儿。