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.
讨论了一类捕食者-食饵系统的参数在某个范围变化时在非零不动点处产生霍普夫分叉的情况，并对其稳定性进行了分析。
This paper discusses the state of Hopf bifurcation in a predator-prey system when parameter varies in some field, and analyzes the stability of the system.
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