单词：tetradic
characteristics of a tetrad; as, a carbon is a tetradic element.
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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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Bosnian Serb war crimes suspect Ratko Mladic plans to boycott a scheduled court appearance Monday at the U.N. war crimes tribunal in The Hague. A lawyer for Mladic said Sunday that the former Bosnian Serb military commander is refusing to appear beca
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