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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This paper posits that the flow at stern will be unusual if designing stern lines without considering of U or V of body lines and exit angle of water lines;

文章认为在船尾型线设计中若不考虑横剖线的UV度、各水线去流角大小等对船体振动的不利影响，很可能会导致艉部水流异常；

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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

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

In early 2011, Chinese telecom-equipment giant Huawei made an unusual request to the U.S. Congress.

FORBES: U.S. Congress Flags China's Huawei, ZTE As Security Threats