核物质密度

2007年VOA标准英语-US Nuclear Agency Faulted for Security Gaps

By Deborah Tate Capitol Hill 12 July 2007 U.S. congressional investigators working undercover say they have obtained a license to buy enough radioactive material for a radiological bomb, without much scrutiny from federal regulators. The investigator

发表于:2018-12-16 / 阅读(81) / 评论(0)

2007年VOA标准英语（七月）

60秒科学:Why Dwarf Galaxies Lack Star Power

Why Dwarf Galaxies Lack Star Power In a study in the journal Nature, researchers show that the relative lack of star density in dwarf galaxies need not conflict with standard cosmological models if you include the blast effects of supernovae. Karen H

发表于:2019-01-02 / 阅读(46) / 评论(0)

60秒科学

Bush Voices Concern About Iranian Nuclear Program

By Scott Stearns President Bush says the international community must stand united in its opposition to Iran enriching uranium, which the United States believes is part of a secret plan to develop nuc

发表于:2019-01-31 / 阅读(40) / 评论(0)

VOA2004（下）--新闻盘点

TED演讲:宇宙的灭亡(2)

This dark energy doesn't behave like any other substance we know at all and acts more like antigravity force. 这种暗能量的性质与我们所熟知的其他物质完全不同，它更像是反重力。 We say that it has a gravitational pressure

发表于:2019-02-13 / 阅读(35) / 评论(0)

TED演讲教育篇

TED演讲:宇宙的灭亡(1)

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

发表于:2019-02-13 / 阅读(39) / 评论(0)

TED演讲教育篇

美语听力 English Cafe 127

Topics: Ask an American: Starving Artist; as a matter of fact, process versus procedure, to haggle Words: to make a living diversity stimulus hard to beat to make it to collaborate to interact gatekeepers density dynamism to cease to exist to push (s

发表于:2019-02-15 / 阅读(33) / 评论(0)

美语听力 English Cafe

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