The boom in intellectual property has been good for the Patent Office; patents are its principal source of income.

知识产权的兴盛对专利局是有利的；专利是他们的主要收入来源。

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The Fed has created its own Office of Financial Stability Policy and Research, with 20 staff, which will be a principal source of expertise for the FSOC.

联储局已成立了自己的金融稳定政策与研究办公室，有20名成员，他们将成为金监会主要的专家来源。

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Other supporters of the prime minister are calling for Mr Fini, the principal cause of Mr Berlusconi’s weakening grip on office, to resign as speaker of the lower house.

贝卢斯科尼大权日益削弱的主要原因就是Fini。 因此，首相的其他支持者要求Fini下课，退居下议院作发言人，但并没有出言不逊。

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And remember, we had an interlude for a long time between the invasion of Afghanistan and the arrival of this President in office where the focus -- the principal focus in the national security sense of the administration was on Iraq, and not on Afghanistan and not on al Qaeda central.

WHITEHOUSE: Press Briefing

According to the Army statement, the resignation of Kenneth A. Steadman, principal deputy in the Army's Office of Legislative Affairs, followed his decision to accept responsibility for distributing the talking points defending the Crusader to Congress.

CNN: Crusader controversy results in career casualty

The other half of the time I spent in the principal's office, unable to explain anything.

CNN: The Foer questions: Literary wunderkind turns 35