本文研究一个种群作用于二个替换食物源的数学模型。
This paper concerns the growth of one predator species for two perfectly substitutable re-sources.
多播是一种群组通信的手段，要求将信息从一个数据源同时传送到多个目的地。
Multicasting is a means of group communications. It delivers information from a source to several destinations in the same time.
比较研究了当年采自田间的褐飞虱种群与上一年虫源在室内越冬繁殖种群对不同抗虫品种的致害性差异。
The virulence characteristics of brown planthopper, Nilaparvata lugens Stal, from paddy field population and greenhouse population collected in late rice field last year was compared.
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