单词:coliform densities
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Effort Launched to Save Africas Lions The African Lion Environmental Research Trust, or ALERT, a conservation and restoration charity, is one of the organizations that will help to kick off the event. The non-profit organization said the lion is a na
This would put a pipeline to take natural gas 将设置天然气运输管线 from the Beaufort Sea through the heart 从波弗特海穿越 of the third largest watershed basin in the world, 世上第三大水域中心 and the only one which is 95 per
Powered Exoskeletons Give Assistance in Walking, Lifting Powered suits that could help paralyzed people walk and others lift and carry heavy loads with ease have been an inventor's dream since late 19th century. But they had to wait until the 21st ce
Few other countries are so dominated by their capital: for Egyptians to speak of one is to speak of the other. The Mother of the World nurtures more than 16 million Egyptians, Arabs, Africans and sundry international hangers-on in a collision of East
City kids have smorgasbord of food choices. But they also face food allergies more than do their country cousins. Researchers mapped food allergies in children across the U.S. And they found more cases per capita in areas with high population densiti
This is the VOA Special English Development Report. The Sahel is the area of Africa that lies between the Sahara desert to the north and more fertile land to the south. The dry plains of the Sahel are mostly treeless. Yet in Niger, one of the nations
助行走外骨骼机器人 Powered suits that could help paralyzed people walk and others lift and carry heavy loads with ease have been an inventor's dream since late 19th century. But they had to wait until the 21st century for the advanced materi
DAVID GREENE, HOST: For the first time, scientists have figured out just how many tiny critters are living inside your kitchen sponge. Now, don't fear. NPR's Michaeleen Doucleff says there is something you can do about this. MICHAELEEN DOUCLEFF, BYLI
So as bad as all that is, things are going to get much worse, much, much worse. 整个情况如此糟糕,而且将会每况愈下。 This is the infrastructure as we see it about now. 以上是我们目前所知的基础设施。 This is what's pla
The calculations focus on a strange quality of all matter. It's one that defies common sense. But it's fundamental to the work of Astrophysicists like professor Douglas Leonard. Solidity is an illusion. If I run up with my fist and punch a burg wall,
But Zwicky was also capable of insights of the most startling brilliance. In the early 1930s, he turned his attention to a question that had long troubled astronomers: the appearance in the sky of occasional unexplained points of light, new stars. 然而
本期真题 1. First published in 1927, the charts remain an ______ source for researchers. A) identical B) indispensable C) intelligent D) inevitable 2. Joe is not good at sports, but when it ______
By Joseph Popiolkowski Hong Kong 11 July 2007 An obscure and non-fatal disease has been spreading among some Western Pacific islands. Joseph Popiolkowski reports from Hong Kong warmer weather and heavy rains have led to an increase in mosquito-borne
When, in 1960, still a student, 1960年我还是学生时, I got a traveling fellowship 拿到出国留学的奖学金, to study housing in North America. 研究北美的住宅建筑。 We traveled the country. 我们游遍美国, We saw public
Looking up at the night sky, we are amazed by how it seems to go on forever. 仰望夜空,我们为它的永无止境而感到惊讶。 But what will the sky look like billions of years from now? 然而数十亿年前的天空又会是什么样子呢
And so, by loading up its ballast tanks, or by sinking obliquely with its slanting fins, 诺第留斯号或者是把所有的储水池装得特别满,或用纵斜机板斜斜下降, the Nautilus successively reached depths of 3,000, 4,000, 5,000,
Science and technology 科学技术 Ancient animal behaviour 远古动物行为 Jurassic lark 侏罗纪雨燕 How the pterosaur caught its supper 翼龙是如何逮到晚餐的 PALAEOETHOLOGY, working out how long-extinct animals behaved, is a subjec
For an hour plains of sand unrolled before our steps. 在一小时内,一片细沙的平原在我们脚下摆开。 Often the seafloor rose to within two meters of the surface of the water. 平原时常升至距海面不及两米的深度。 I coul
After its fishing was finished and its air supply renewed, 鱼捕完了,空气调换了, I thought the Nautilus would resume its underwater excursion, 我想诺第留斯号又要作海底旅行了; and I was getting ready to return to my stater
-Penny:Leonard might come home. Leonard可能快回来了。 Can we talk in my apartment? 能到我的公寓里谈吗? -Sheldon:We're not done? 还没说完? -Penny:No. 没有。 -Sheldon:Eh, why not? 哎呀,好吧。 We're already through