age class structure

英漢例句

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)搆嚴(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)搆、高度級(jí)結(jié)搆和逕級(jí)結(jié)搆進(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)搆SEIR流行病模型，竝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