美国有线新闻 CNN 水中何种元素引发癌症?（在线收听）

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 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 scrutiny 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。

SUBTITLE: 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 stainless 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 fetus.

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。