stability of low fertility rate 稳定低生育水平
Soil aggregate stability is a key property of soil, and reflects soil fertility.
团聚体稳定性是土壤的基本性质，反映了土壤肥力的高低。
This pape probes to the stage-structure systtm with nonlinear fertility rate, making clear the ample conditions of the systtm's global stability of the equilibriums.
研究具有非线性生育率的阶段结构系统，得到了该系统平衡点全局稳定性的充分条件。
A study has been made on the stability of fertility transformation of HPGMR Nong-Ken 58a and its pollen morphology under Scanning Electronic Microscopy.
对HPGMR农垦58 A进行育性转换的稳定性研究，用扫描电镜观察其花粉外部形态。
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