单词：tetravalencea
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This is Scientific American Sixty Seconds Science, I'm Sophie Bushwick, got a minute? When Mexican tetra fish moved into darker caves long ago, they evolved to deal with the dark by becoming albino and going blind. A new research shows that the chang
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T Tanshinone IIA 丹参酮IIA Tanshinone I 丹参酮I Tanshinone IIB 丹参酮IIB Taraxasterol 蒲公英甾醇 Taraxerol 蒲公英赛醇 Tauro ursodesoxy cholic acid 牛磺熊去氧胆酸 Taxifolin 花旗
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By Robert Berger Jerusalem 15 September 2006 UNIFIL Spanish soldier holding M60 machine gun stands guard near navy divers as Lebanese boy looks on More international troops are arriving in Lebanon to enforce the one-month-old ceasefire between Israe
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By Stephanie Ho Washington 23 July 2006 Lebanese Prime Minister Fouad Siniora says Israeli bombing of Hezbollah targets in Lebanon is forcing his country to its knees. In a television interview, the Lebanese leader said the first crucial step toward
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Somalia's Ethiopia-backed transitional government has agreed on a date for the withdrawal of Ethiopian troops from two major Somali cities in a new cease-fire deal between the government and an opposition faction. But VOA Correspondent Alisha Ryu in
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African Union Commission Chairman Jean Ping has opened an international conference on Libya with a call for an immediate end to hostilities and dialogue between the Gadhafi government and rebels. But a hoped-for appearance by a Libyan rebel represent
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Russia and Georgia have signed a European-mediated ceasefire agreement, but each side continues to accuse the other of violating the terms. As VOA's Sonja Pace reports from London, efforts now are on diplomacy to end the fighting, but the conflict's
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By Suzanne Presto Irbil 10 May 2008 Spokesmen for the Iraqi government and the movement of radical Shi'ite cleric Moqtada al-Sadr say the two sides agreed to a truce Saturday to end weeks of fighting in Baghdad's Sadr City. Hundreds of people have be
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10 Getting The Lead Out 第十章 把铅撵出去 In the late 1940s, a graduate student at the University of Chicago named Clair Patterson (who was, first name notwithstanding, an Iowa farm boy by origin) was using a new method of lead isotope measur
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