The dynamic loads of engine in tractor-trailer unit are classified into four kinds with frequency structure.

拖拉机挂车机组工作时的动态载荷按其频率结构可分成四类。

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Using frequency spectrum analysis of phase function to calculate its auto power spectrum can reflect its frequency structure.

利用相函数的频谱分析求其自功率谱，可以反映它的频率结构。

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The results showed that vibration strength and frequency structure of any spot of the combine are different with the different working conditions.

研究结果表明：小麦联合收获机任一点的振动强度、频率结构随工况不同而变化。

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The Pentagon feared the frequency structure being demanded by Brussels in the so-called Upper L Band between 1559 and 1591MHz could have prevented American commanders from degrading navigation data in the theatre of war to all but their own forces, as is possible at present.

BBC: NEWS | Science/Nature | EU-US strike sat-navigation deal

The issue becomes just the latest in a long list of issues the SEC is examining regarding the current U.S. market structure, right up there with high frequency trading, dark pools, flash trading, market access, and trade tracking and reporting.

FORBES: SEC Takes Aim at Wild Market Swings

In reality, the markets (in part driven by privately held firms like Getco) have been evolving to a structure that caters to electronic trading, high frequency or otherwise.

FORBES: Out With the Old, In With the New