本文研究了一类三种群离散型捕食者食饵系统。
In this paper, a class of predator-prey systems of three species with discrete time is studied.
该系统是由一个捕食者，二个食饵种群所构成。
The system has three species, where two prey and one predator.
研究了一类具有时滞的基于比率型三种群捕食者-食饵系统，给出了系统持续生存的条件。
A three-species ratio-dependent predator-prey model with time delays is investigated, conditions are given for persistence of the system.
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