In the light of experimental results on variation in fertility of photo (temperature) sensitive sterility line of rice proposed are the eigenvalues and a quantifying model for the variation.

依据水稻光(温)敏不育系育性变化的实验结果，提出衡量不育系育性变化规律的特征值及其量化模型。

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Studied the soil fertility on south slope in Qinling Mountains, the spatial distribution and variation pattern and its relation with altitude.

对秦岭南坡土壤肥力状况、空间分异规律及其与海拔的关系进行研究。

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"With only a small variation in fertility, particularly in the more populous countries, the total could be higher: 10.6 billion people could be living on Earth by 2050 and more than 15 billion in 2100, " says the Population Division of the U.N.

CNN: U.N.: World can 'thrive' as population reaches 7 billion