What seems certain is that the nitrogen cycle is changing faster and more profoundly than the carbon cycle, which has attracted much more attention.

显而易见的是，「氮循环」比「碳循环」更可怕，变迁得更快，影响也更广泛，不过大家比较关心的却还是「碳循环」。

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Each link closely network marketing resources, through the cycle to keep the high attention and exposure, at a low price for the largest advertising effect.

各环节紧扣网络销售资源，通过这种循环保持着极高的关注度与曝光率，以极低的代价换取了最大的广告效应。

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For example, operator selection and training, leader training, employment doctrine, LAMV basis-of-issue plans, and LAMV life-cycle management all require the Army's attention.

例如，驾驶员的挑选和训练、指挥员的训练、任用条令、IAMV拨发基数计划以及LAMV寿命管理，所有这些都需要引起美国陆军的注意。

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The reality of the issue attention cycle suggests that gun control advocates' best hope may lie in executive action, not the legislative process.

CNN: How media lose interest in gun control

That's the minimum standard for getting our attention on a busy news cycle.

NPR: Au Contraire, Economics

Finally, it pledged greater attention to the needs of pedestrians and more cycle lanes.

ECONOMIST: Transport