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发表于:2018-12-01 / 阅读(129) / 评论(0)

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发表于:2018-12-07 / 阅读(104) / 评论(0)

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发表于:2018-12-07 / 阅读(85) / 评论(0)

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发表于:2018-12-07 / 阅读(83) / 评论(0)

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For all you space buffs who like to keep track of where the water is, it looks like you can add our very own moon to your list. Because according to a trio of papers appearing in the journal Science, the lunar surface is wetter than we realized. Fort

发表于:2018-12-24 / 阅读(65) / 评论(0)

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发表于:2018-12-25 / 阅读(66) / 评论(0)

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Why does Florida have so many springs? Florida sits on a layer of porous limestone which acts as an underground reservoir or aquifer. This aquifer can absorb huge amounts of water. Where the pressure is great enough, springs bubble up, spewing up bil

发表于:2018-12-26 / 阅读(71) / 评论(0)

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发表于:2018-12-31 / 阅读(46) / 评论(0)

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‘Smart’ Thermometers Record Spread, Intensity of Influenza

When a child feels sick, one of the first things a parent does is reach for a thermometer. That common reaction got one man thinking. Inder Singh is a health policy expert. He wondered what if the thermometer, in addition to measuring body temperatur

发表于:2019-01-03 / 阅读(339) / 评论(0)

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Mars Rover to Begin Taking Soil Samples This Week

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发表于:2019-01-04 / 阅读(106) / 评论(0)

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发表于:2019-01-08 / 阅读(149) / 评论(0)

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Temperature 温度 Temperature is how cold and how hot the outside air is. 温度是指外面空气的冷热程度。 It is measured by a thermometer. 可用温度计测量。 Also, people feel temperature with their bodies. 人们的身体也能感受

发表于:2019-01-10 / 阅读(96) / 评论(0)

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2015-07-03 BBC:巨石阵行动:被埋藏的秘密-4

Recently at a site only two kilomtres to the southeast, archaeologists have unearthed the first traces of people living in the same period. It's a find that may finally answer why stonehenges located where it is. Here is the section through one of th

发表于:2019-01-23 / 阅读(82) / 评论(0)

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DEVELOPMENT REPORT - Need to Dig a Well? Start HereBy Gary Garriott Broadcast: Monday, May 15, 2006 This is Shep O'Neal with the VOA Special English Development Report. There are several low-cost ways

发表于:2019-01-30 / 阅读(83) / 评论(0)

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56 自然原因导致夏季食物中毒比率偏高 DATE=6-12-01 TITLE=AGRICULTURE REPORT - Food Poisoning in Summer BYLINE=George Grow (Start at 59

发表于:2019-01-30 / 阅读(78) / 评论(0)

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Spacecraft see 'damp' Moon soils

We are rediscovering the enigmas(谜团) of the Moon and they're really in our own backyard Dr Jim Garvin, Nasa Goddard Space Flight Center Moon water has world in a twitter A surprising amount of water has been found to exist in the Moon's soil. Data

发表于:2019-02-18 / 阅读(74) / 评论(0)

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在肯塔基州路易斯维尔，有位已故的老人，她叫Nadine Stair ，在她85岁高龄的时候，有人问她，如果她再有一次生命的话，她会做些什么。下次我犯的错误会更多，她回答道。 When the late Nadine

发表于:2019-02-19 / 阅读(64) / 评论(0)

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I Would Pick More Daisies When the late Nadine Stair of Louisville, Kentucky, was 85 years old, she was asked what she would do if she had her life to live over again. I'd make more mistakes next time, she said. I'd relax. I would limber up. I would

发表于:2019-02-19 / 阅读(53) / 评论(0)

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Plants in the Deserts Some cacti, like the saguaro, grow to tree size, but true trees need more moisture than most desert environments can supply, so they are scarce on deserts. Close to streambeds, cottonwoods can sometimes be found. Though these st

发表于:2019-02-25 / 阅读(59) / 评论(0)

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