Russia's RIA Novosti news agency, quoting an unidentified source, said the plane likely crashed because of a technical malfunction or pilot error.

俄罗斯的俄新社引述一个没有公布身份的消息来源的话说，飞机坠毁的原因可能是技术故障或者是飞行员操作失误所致。

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After months of observations, he noticed that one unidentified yet persistent source of noise was coming from the direction of the constellation Sagittarius.

经过几个月的观测之后，他注意到一个来自人马座方向的无法识别，但一直持续不断的噪声源。

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In this case, a leading possibility is that the signal originates from an unusual modulation between a GPS satellite and an unidentified Earth-based source.

在这种情况下，最主要的可能性是这道信号来源于一个一颗GPS卫星和未确认的地球发射源之间的不寻常的调制信号。

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Last week, a report from veteran U.S. television journalist Dan Rather described Chavez's health situation as "dire, " citing an unidentified source's assessment that the Venezuelan president may not see the final results of the October elections due to the progression of his cancer.

CNN: Venezuela's Chavez appears chipper, energetic on state TV

Reid's unsubstantiated claim, based on an unidentified source, was intended to keep alive the push by Democrats to force Romney to release more of his past tax returns than the two years disclosed so far -- his 2010 filing and an estimate for 2011.

CNN: Presidential campaign gets even dirtier

Novak said the special prosecutor already had waivers from all three of his sources - that is Mr. Rove, Mr. Harlow, and this third primary and unidentified source - to testify before the grand jury that was trying to figure out whether to indict people on this stuff.

NPR: Novak Reveals Details of CIA Identity Leak