Developed with the U. S. Air Force Research Laboratory, and further refined with NASA, the HWB also features an unusual propulsion arrangement that houses the engines in overwing nacelles.

与美国空军研究实验室开发，并与美国航空航天局进一步改进，在引擎机舱的发动机上，HWB还具有一个不寻常的推进配备。

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Bernanke's bluntness was unusual because people assume the U. S. is now dependent on China to buy its debt.

贝南克的率直是不同寻常，因为人们都认为美国现在依赖于中国购买其债券。

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We told you last year that very unusual conditions then existed in the corporate and municipal bond markets and that these securities were ridiculously cheap relative to u.

我们去年曾告诉你，公司和市政公债市场存在非常罕见的情况，这些证券与美国财政部的相比非常便宜，我们通过几项采购支持了这个观点。

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But General McChrystal has warned that more are needed. On the contested outcome of last month's presidential election in Afghanistan, Spanta said voting "irregularities" are not unusual in emerging democracies and that the Independent Electoral Commission and the U.N.-supported Election Complaint Commission are working to address the complaints and recount some of the ballots.

VOA: standard.2009.09.29

But U.S. law-enforcement officials say it isn't unusual for security agencies to withhold details of wiretaps or decline to tell foreign agencies how they came across information.

WSJ: Officials Seek to Question Suspect's Widow

The President also declared a national emergency pursuant to the International Emergency Economic Powers Act, 50 U.S.C. 1701-1706, to deal with the unusual and extraordinary threat to the national security and foreign policy of the United States constituted by the actions and policies of the Government of Burma.

WHITEHOUSE: The White House

On July 24, 2011, by Executive Order 13581, I declared a national emergency pursuant to the International Emergency Economic Powers Act (50 U.S.C. 1701-1706) to deal with the unusual and extraordinary threat to the national security, foreign policy, and economy of the United States constituted by the activities of significant transnational criminal organizations.

WHITEHOUSE: The White House