单词：extra high pressure mercury vapor lamp
单词：extra high pressure mercury vapor lamp 相关文章
Conditions on Mars were so harsh that it was hard to imagine any life surviving there. The idea of sophisticated aliens was wiped out. We know that conditions on Mars today are not very good for life.
火星生命
Studies that will be released today show that fish, birds and mammals in New England have significant amounts of mercury in their bodies. The studies find the toxic metal in some unexpected habitats and they suggest that power plants in the Midwest a
2009年NPR美国国家公共电台7月
The Mercury Mess By Samantha Levine / 2004, as first appeared in U.S. News nbsp; What are the dangers of mercury in fish? Can the mercury mess be cleaned up? 1 Are these fish safe to eat?” It’s a
彭蒙惠英语
X-Ray Technology Helps Recover Lost 19th-Century Images The worlds very first photographs were taken in the 1830s. Scientists now say they have found a way to recover lost images made from the very first photographic process. The new method uses X-ra
2018年VOA慢速英语(七)月
EDUCATION REPORT - Summer School in the U.S. By Nancy Steinbach Broadcast: Thursday, July 22, 2004 This is Steve Ember with the VOA Special English Education Report. Recently we discussed the idea of
教育与新闻
HEALTH REPORT – December 11, 2002: Mercury Levels in Fish By George Grow This is the VOA Special English Health Report. Two studies are adding to the debate about the health risks of eating fish con
健康与环境
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美联社新闻一分钟2007
By Carol Pearson Washington 22 August 2007 High blood pressure, or hypertension, is a disease usually associated with adults, but children can get it too and can have serious health problems because of it. A new study is now calling for pediatricians
2007年VOA标准英语（八月）
VOA常速英语2014--High Blood Pressure in Young Adults Could Lead to Heart Disease 青年时血压高能导致心脏病 February is heart health month, and a new study that provides clues to young people about keeping their hearts healthy. The stud
VOA标准英语2014年(二月)
In contrast, Jupiter and Saturn are all atmosphere. Unlike Earth, Jupiter doesnt really have a solid surface that you could stand on and then have your head up in the atmosphere looking at the clouds. Its just a giant, giant gas ball. Only one other
探索与发现2014年
The U.S. space agency(代理中介) has released the first ever image taken of the surface of Mercury from a spacecraft orbiting the planet. The black and white image, posted on the NASA website Tuesday, shows a surface pocked with craters of varying
英语新闻
By Melinda Smith Washington 12 September 2007 A recent study indicates that a disturbing number of American children with high blood pressure go undiagnosed. The study has prompted discussion worldwide about whether hypertension among children is jus
2007年VOA标准英语（九月）
Congratulations, you've arrived on the hottest surface in the solar system. Here, the official temperature is eight hundred seventy degrees Fahrenheit. Day or night, equator or pole, the searing heat never varies more than a few degrees, and thats wh
自然百科2012年
【英文原文】 If I were to stop drinking water right now, how long could I live? There are several different factors involved here. A human being isnt an automobile which needs a certain amount of gas. There are conditions under which a person c
英语听力广播—Listening
The Invisible Hand 无形的力量 A: What's going on? B: Check out the setup , Yaoyao. A: A stove, an empty aluminum soda can, kitchen tongs , and a saucepan . Are you experimenting with a new recipe ? B:No, i'm experimenting with air pressure. A:Ho
英语听力文摘 English Digest
Dehydration 脱水 If I were to stop drinking water right now, how long could I live? There are different factors involve d here. A human being isnt an automobile which needs a certain amount of gas. There are conditions under which a person could di
英语听力文摘 English Digest
Camels 骆驼,被称做为沙漠之舟,它能够忍耐干燥酷热的环境,并且可以在水源极其缺乏的浩瀚沙漠里长途跋涉,是人们沙漠之旅中不可缺少的伙伴.那么,人们是不是真的了解骆驼呢?曾经有两位美国科
英语听力文摘 English Digest
Toxin-loving Trees 树木能调节气候,保持生态平衡，树木通过光合作用，吸进二氧化碳,吐出氧气,使空气清洁，新鲜。一亩树林放出的氧气够65人呼吸一辈子。树还能防风固沙，涵养水土,吸收各种粉
英语听力文摘 English Digest
Surmounting Life's Obstacles - Do You Cling to What You Were Before? 跨越生命中的障碍 您还坚持原来的样子吗? A little stream flowed down from a high mountain far, far away through many villages and forests, until it reached a desert.
英语美文