单词：tau-meson
[医] τ介子
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This is Scientific American's 60-Second Science, I'm Steve Mirsky, got a minute? Every Star Trek fan knows theres matter and antimatter, but why is there apparently so much more matter than antimatter？Scientific American's JR Minkel: Two recent exp
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By Selah Hennessy Dakar 24 September 2007 As part of a peace deal with militant ethnic Tuaregs in northern Mali, the country's government has pledged $2 million towards development. Analysts say long-awaited diplomacy and development aid is crucial i
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2007年VOA标准英语（九月）
2007年VOA标准英语（九月）