得到一些正周期解存在的充分条件。
Some sufficient conditions for the existence of positive periodic solutions are obtained.
研究了周期函数及其最小正周期的若干问题。
利用重合度理论证明系统正周期解的存在性。
The existence of the strictly positive periodic solution of the system is proved by using coincidence degree.
You know that some viruses use RNA as their genetic material and so their lifecycle is going to be slightly different than this.
有些病毒利用RNA作为遗传物质,而且正因如此,它们的生命周期,会与前者有所不同
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