age class structure

常見例句

But stand volume descents to a great extent, age class and stand density structure are maladjusted badly, and the number of stand growth is low.
但蓄積量大幅下降，林分的齡組、密度結(jié)構(gòu)嚴(yán)重失調(diào)，林分生長量偏低。
The age class structure of Acanthopanax senticosus population was stable in the Quercus mongolica forest, but they were unstable in the theropencedrymion and secondary forest.
對(duì)不同生境下刺五加種群的年齡級(jí)結(jié)構(gòu)、高度級(jí)結(jié)構(gòu)和徑級(jí)結(jié)構(gòu)進(jìn)行了研究。
In this paper, we establish a kind of new class age-structure SEIR epidemic model with impulsive vaccination and nonlinear infectivity, which contains ODEs and PDEs at the same time.
建立了一類新的帶有脈沖接種的類年齡結(jié)構(gòu)SEIR流行病模型，并考慮其具有非線性傳染率。

Put simply, the market penalizes integration: The higher the percentage of blacks in the neighborhood, the less the home is worth, even when researchers control for age, social class, household structure, and geography.
FORBES: How Home Ownership Keeps Blacks Poorer Than Whites