In the second section, considering the permanent immunity factor, the SEIR epidemic model with infectious force in the latent period which makes the model more universal is investigated.
第二部分考虑了永久免疫力因素，研究了一类潜伏期具有传染力的SEIR模型，使模型更具有广泛性。
The research that modern medicine learns thinks, enhance body immunity force head turns yellow over sixty years of age.
现代药学的研究认为，增强身体免疫力首推黄耆。
The research that modern medicine learns thinks, enhance body immunity force head turns yellow over sixty years of age.
现代药学的研究认为，增强身体免疫力首推黄耆。
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