英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

美国科学60秒 SSS 2012-12-04

时间:2013-06-25 07:58来源:互联网 提供网友:gmeng   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

 Mercury tends to show up in strange places, like swordfish and sharks. Now researchers have detected small amounts of mercury in the fog that bathes the California redwoods, near Santa Cruz.

 
The mercury levels they've measured are in parts per trillion, orders of magnitude less than the more worrisome parts per million levels tracked by the EPA and FDA. So the fog is not dangerous. But it does contain four times as much mercury as local rainwater does.
 
And when the fog rolls in, it collects on redwood leaves, and drips to the ground, where it enters the food chain. Preliminary data suggest that during the foggy season, wolf spiders in the area see their mercury levels multiply by five. The findings were presented at a meeting of the American Geophysical Union in San Francisco.
 
Researchers say the mercury in coastal1 fog probably comes from deep ocean waters, which well to the surface every summer. But its original source may be coal-burning power plants, or pollution from mercury mines dating back to the gold rush. Either way, it's a reminder2 that whatever we dump into the environment will probably pay us a return visit.

点击收听单词发音收听单词发音  

1 coastal WWiyh     
adj.海岸的,沿海的,沿岸的
参考例句:
  • The ocean waves are slowly eating away the coastal rocks.大海的波浪慢慢地侵蚀着岸边的岩石。
  • This country will fortify the coastal areas.该国将加强沿海地区的防御。
2 reminder WkzzTb     
n.提醒物,纪念品;暗示,提示
参考例句:
  • I have had another reminder from the library.我又收到图书馆的催还单。
  • It always took a final reminder to get her to pay her share of the rent.总是得发给她一份最后催缴通知,她才付应该交的房租。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   美国60秒科学  SSS  英语听力
顶一下
(1)
100%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴