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。
2
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。
3
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.