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。

youdao

For millennia the average person's stance toward providing for himself had been, ultimately I'm on my own.

几千年来，一般人对于养活自己的立场是，最终我要靠自己。

youdao

Once the soil has been removed by erosion, only the passage of centuries or millennia will enable new soil to form.

一旦土壤被侵蚀，新的土壤只有经过几个世纪或几千年才能形成。

youdao

"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