贝尔博士和同事在《自然科学》杂志上透露了他们的发现：1928年至1939年间，三种鱼在每个年龄段的数目均平稳下滑。
As they reveal in Naturwissenschaften, Dr Beare and his colleagues found that populations of all age groups of all three species declined steadily between 1928 and 1939.
本文主要研究具有扩散和年龄结构的三种群竞争系统的最优收获策略问题。
This paper is mainly concerned with optimal harvesting policy for three competing species with age-dependent and diffusion.
在描述鳞片、背鳍条和矢耳石三种材料轮纹特征的基础上，比较了这些年龄鉴定材料在判读错鄂裸鲤年龄和反映生长特征上的异同。
The characteristics of three kinds of age determination materials, otoliths scales and dorsal fin spines from Gymnocypris cuoensis had been described and compared in their using in age determination.
年龄越高，儿童区分三种比较难度的能力越好，在跨边界条件下优势越明显。
The older, the better the children's capability of making differences among three kinds of comparison difficulties and the more significant the performance superiority under the cross-half condition.
结果表明随着年龄的增大，三种材料的记忆广度都有显著的下降，记忆的搜索速度也减慢；
The older participants showed significant decrease in memory span tasks with three kind of materials, including digits, colors, and familiar geometrical figures.
另外，EPS中这三种代谢物的绝对浓度看起来与年龄无关的。由于不需要年龄作为混杂变量，增加了这些标记物的潜在效用。
Further, the absolute concentrations of these metabolites in EPS appear to be independent of age, increasing the potential utility of these markers due to elimination of age as a confounding variable.
另外，EPS中这三种代谢物的绝对浓度看起来与年龄无关的。由于不需要年龄作为混杂变量，增加了这些标记物的潜在效用。
Further, the absolute concentrations of these metabolites in EPS appear to be independent of age, increasing the potential utility of these markers due to elimination of age as a confounding variable.
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