Clay answered that no power on earth could force him to vote to establish slavery where it did not exist.

VOA: special.2009.03.19

And so there are only two kinds of waves that can exist on this violin string, standing or traveling.

由于这只有两种波,可以存在在这条弦上，驻波或行波。

麻省理工公开课 - 固态化学导论课程节选

I don't even exist on Wednesday I died myself on Tuesday ? How can I kill him after I'm dead?

我星期三压根就不存在了,我星期二就死了,我怎么可能在我死了之后杀了他？

耶鲁公开课 - 死亡课程节选

They wear blinders to what is going on around them, and exist on auto-pilot.

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The bluesy scales and shuffling rhythms American rock fans grew up on also exist in West African traditional music, via the history of the Atlantic slave trade.

NPR: Vieux Farka Toure, Justin Adams & Juldeh Camara: Rock 'N' Roll Goes To West Africa

While many seniors object to cutting back on Medicare Advantage programs, the fact remains that these programs exist on a government subsidy that results in Medicare paying 12% more for services and procedures than what would be paid by Medicare directly to the care giver, hospital, etc.

FORBES: Rating The Deficit Panel's Dramatic Entitlement Reforms