This pattern has never been used on the American flag.

这种模式还从来没有在美国国旗上出现过。

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Though 37 years passed after the double arch and flat shell structure applied in the water power engineering, the rubber canvas faceplate has never been used.

薄壳空间结构具有很多优点，我国在水工闸门中使用双曲扁壳结构的历史已有37年，但尚未见到采用橡胶布面板的。

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Bank regulators believe the 'systemic risk' clause in federal law gives them the authority to lift insurance limits, though it has never been used to do so before.

银行监管机构认为，联邦法律中设定的“系统性风险”条件赋予了他们取消保险上限的权限，虽然以前他们从没这么做过。

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The book is kept by the Library of Congress and has never been used at another swearing-in.

VOA: special.2009.01.19

The trial heard that the computer analysis system he uses has never been used in a UK Court.

BBC: Patrick Azimkar (left) and Mark Quinsey

"Reconciliation has never been used for a massive rewrite of policy like this, " says Judd Gregg, a Republican senator from New Hampshire.

ECONOMIST: Reader debate

The format has never been used in any major U.S. sport aside from football, which naturally lends itself to the plan as a once-a-week game.

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