growth ring

基本解释

And the availability and effectiveness of the algorithm is proved by forecast of timber growth ring density.
并以木材生长密度预测为例，验证了算法的有效性。
The results of the energy spectrum analysis showed that, iron element was the main material of the growth ring, which account for more than 30%.
能谱分析结果表明，铁元素占生长环的质量分数在30%以上，是生长环的主要组成物质；
Appearance: diffuse-porous wood, half ring hole material tendency obvious, growth ring slightly obviously, heartwood red brown to purple brown, sawdust water extract of red;
外观：散孔材，半环孔材倾向明显，生长年轮略明显，心材红褐至紫红褐色，木屑水浸出液红色；

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If the global trend continues for the next 20 years, then global growth in the 21st century will ring in at a clip superior to the historic period we call the Great Dollar Standard Era from the breakdown of Bretton Woods in 1971 through the palliative Y2K freakout.
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