It is certainly hard to spot bubbles; but central Banks already grapple with other imponderables, such as the size of the output gap or the level of structural unemployment.

识别经济泡沫开始形成当然有难度，但央行已经有过处理其他不可预知事件的经验，像衡量产出缺口的大小或结构性失业率的水平。

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The related structural parameters of vehicle body gap are changed respectively, to investigate the corresponding variation in the electromagnetic shielding effectiveness of vehicle body gap.

分别改变车身缝隙模型的相关结构参数，考察相应的电磁场屏蔽效能的变化。

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The stop-frequency gap and the transmission resonance are observed for certain structural parameters due to mode-mode coupling.

在一定的结构条件下，由于声子模与模的耦合作用，出现了共振透射和禁止频带。

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We have a structural gap between the money going out and the money coming in.

WHITEHOUSE: Job Creation and Economic Growth

Another structural problem in the labour market is the gap between the public and private sector.

BBC: Unemployment set to rise in 2012, suggests CIPD

The huge gap between job openings and jobless numbers suggests something insidious and possibly structural: a talent crunch.

FORBES: Talent Crunch Threatens U.S. Recovery. Software To Rescue