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Helium is the by product of millennia of radioactive decay from the elements thorium and uranium.

氦是钍和铀元素数千年放射性衰变的副产品。

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"Rinderpest affected Africa, Asia and Europe for millennia and caused widespread famine and decimated millions of animals, both domestic and wild."

VOA: special.2010.11.02

Long before Milton had begun to tackle the problem, Christians had for centuries, for millennia, puzzled over the logical inconsistency between these two concepts.

早在弥尔顿应对这个问题之前，基督教徒们就已经花了成百上千年，为这两个概念之间逻辑上的前后矛盾感到困惑。

耶鲁公开课 - 弥尔顿课程节选

If they can organize as well in Yemen or Somalia or someplace else, then why fight in Afghanistan where no one has been successful for millennia?" U.S.public-opinion surveys show declining support for the war in Afghanistan.

VOA: standard.2009.11.23

That may not be so unusual when set against three millennia of conflict in the Med.

ECONOMIST: History��s most important sea

Decades, centuries, millennia from now, when only cockroaches are left, which format will remain?

FORBES: Magazine Article

For millennia, human society has struggled with what to do with young men's violent tendencies.

CNN: The overwhelming maleness of mass homicide