A core taken so as to preserve the in-situ water saturation of the rock. A native-state core is usually drilled with oil-base mud or crude oil from the same reservoir.

使用油基泥浆或原油钻取的岩心，以保证岩心的含水饱和度与岩石在储集层状态的含水饱和度相同。

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Now,the Obama administration supports what are known as the Common Core State Standards.

VOA: special.2010.07.22

Nearly every state in the U.S. is adopting some form of the standards, known as the Common Core State Standards, but New York is one of the first states testing students on the changed content.

WSJ: Cheating Claims Rock Long Island

Private-housing prices in the city-state's core central region rose 0.6% in the second quarter, compared with a 0.6% fall in the January-April period.

WSJ: Singapore Home Prices Swing Higher

Justice Anthony Kennedy suggested that Doma was an attempt by Congress to "regulate" marriage, which under the Constitution is a core state police power.

WSJ: Review & Outlook: 'Til the Supreme Court Do Us Part