Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.

爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。

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But their emphasis on growth frequently led them to lend excessively, as they did to Latin America, resulting in massive write-downs and periodic financial crises.

但他们频繁强调增长导致放贷过度，正如他们在拉丁美洲所做的，导致大量资产减值和周期性金融危机。

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Likewise, the giant sequoia redwoods of coastal California rely on periodic fires to thin out the competition and clear the ground and canopy ready for new growth.

同样，加利福尼亚沿岸的红杉林也依靠周期性的火灾来减少物种间的竞争，并为植物的新生清理地面和树荫。

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Against a backdrop of Federal Reserve policy, lackluster U.S. economic growth and periodic market panics over the European debt crisis, and signs of an economic slowdown in China, yields on 10-year Treasurys have hit levels previously thought almost impossibly low.

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The stable monetary policy disciplined by fixed exchange rates also minimized the boom and bust business cycle, with its periodic sharp recessions hampering long term growth.

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The flaw in their theory was that forests need periodic episodes of destruction to clear out old growth and dead wood so that new, more vigorous growth can flourish.

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