单词：alkali-earth
alkali-earth的用法和样例：
例句
- Rare earth luminescence materials of alkaline earth stannates have also been prepared via thermal decomposition of hydroxo stannate precursors.利用某些新型带羟基的碱土锡酸盐作为前驱体，固相反应合成掺稀土的锡酸盐发光材料。
单词：alkali-earth 相关文章
Black and White黑与白 Sometimes you hear it said that white is a combination of all the colors of the rainbow -- and that black is the absence of color. Find out more about whether black and white are colors -- today on Earth and Sky. JB: This is Ear
(科普英语)Earth and Sky
September Equinox 秋分 We have an equinox because an imaginary plane extending outward from Earth's equator isn't the same as the plane of Earth's orbit around the sun. Learn more about today's equinox -- on Earth and Sky.. JB: This is Earth and Sky
(科普英语)Earth and Sky
Raindrops 雨滴 From a light rain to a heavy downpour, raindrops fall to Earth's surface. And if you watch over time, you'll see that some raindrops are small and some much larger. Find out why -- on today's Earth and Sky. DB: This is Earth and Sky,
(科普英语)Earth and Sky
alkali碱 alloy结合体 aluminum铝 ajar半开的 bleach漂白 catalyst催化剂 compound化合物 crystal水晶 combustible易燃的 distill提炼 electrician电工 erase抹掉 flask烧瓶 fuse融合 hydrogen氢气 insulate隔热 intrinsic内在的
80天攻克雅思核心词汇
King of Beasts 狮子 Even skywatchers connect lions with royalty. For example, the brightest star in the constellation Leo the Lion is called Regulus -- which means little king. Discover why lions are said to be the king of beasts -- today on Earth a
(科普英语)Earth and Sky
Fire Regime 火 Fire was a creation of life -- born from oxygen and organic matter -- ignited by lightning. Thus fire has been a fundamental feature of the Earth for at least 400 million years. A scientist talks about fire -- today on Earth and Sky.
(科普英语)Earth and Sky
Sunscreened Plants 遮光植物 A NASA researcher is finding that alfalfa plants grow more poorly when exposed to UVB -- ultraviolet B radiation from the sun. Learn more about sunscreened plants -- today on Earth and Sky. JB: This is Earth and Sky. Eart
(科普英语)Earth and Sky
Amazon GIS 亚马逊地理信息系统 In the Amazon, there's a growing human population in a region that also contains 30% of Earth's total plants and animals. Learn how scientists have put together an Internet window to the Amazon -- today on Earth and Sky
(科普英语)Earth and Sky
Forests and CO2 森林和二氧化碳 The amount of fossil fuel emissions released into the atmosphere has steadily risen since the Industrial Revolution. But recently, part of those emissions have been disappearing. Learn more about forests and CO2 -- on
(科普英语)Earth and Sky
迈克尔.杰克逊：Earth song Earth Song 地球之歌 演唱：Michael Jackson What about sunrise 日出呢 What about rain 雨呢 What about all the things 还有你说过 That you said we were to gain... 我们会得到的一切呢...... What ab
迈克尔杰克逊经典歌曲
heaven on earth we need it now i'm sick of all of this hanging around sick of sorrow i'm sick of the pain i'm sick of hearing again and again that there's gonna be peace on earth where i grew up there
欧美绝对经典 U2
LOS ANGELES, June 24 (Xinhua) -- Near-Earth asteroid 2011 MD will whip past Earth on June 27, but will not pose any threat, NASA's Jet Propulsion Laboratory (JPL) said on Friday. The asteroid will pass only 12,000 kilometers (7,500 miles) above the E
英语新闻
Broadcast: April 18, 2003 by Caty Weaver and George Grow. This is the VOA Special English Environment Report. On April twenty-second, millions of Americans and people around the world will observe the
VOA2003（上）-社会广角
LOS ANGELES, June 3 (Xinhua) -- Eating earth may protect the stomach against toxins, parasites and pathogens, a new study suggests. To examine the possible benefits from eating earth, researchers at Cornell University analyzed reports from missionari
英语新闻
【经典】《地球之歌》Earth Song 由迈克尔 杰克逊演唱的《Earth Song 》，这是一首环保歌曲，创作自1995年，当时世界战争不断，污染越来越严重，在那样的历史背景下，迈克尔杰克逊亲自作词，
经典英文歌曲
SAN FRANCISCO, Oct. 5 (Xinhua) -- Google announced Wednesday that Google Earth, the tech giant's virtual globe, map and geographical information program, has been downloaded more than one billion times since it was first introduced in 2005. According
英语新闻
Earth Day events were held around the globe Sunday, including in Washington. Inclement weather kept away all but the most-dedicated environmentalists. Months of near-drought conditions gave way to steady rain that drenched the nations capital and the
英语新闻
BEIJING, June 28 (Xinhuanet) -- A truck-sized asteroid passed over the Atlantic Ocean within 7,500 miles of the Earth on Monday, according to NASA's Jet Propulsion Laboratory. The space rock, called asteroid 2011 MD, is the second space rock to zip e
英语新闻
Millions of people around the world celebrated Earth Day Friday by pledging to commit personal acts of green to improve the environment(环境). This is the 41st anniversary of the first Earth Day, observed in the United States in the aftermath of a
英语新闻
音乐咖啡厅:Justin Bieber - Down to earth 相关介绍：My World是少年歌手贾斯汀比伯(Justin Bieber)的个人首张专辑，将于11月17日发行。年仅15岁的贾斯汀比伯(Justin Bieber)来自加拿大，是由Usher一手捧红的新
音乐咖啡厅