These expeditions were likely driven by populationgrowth and political dynamics on the home islands, as well as the challenge and excitement of exploring unknown waters.
这些探险很可能是受当地人口增长和政治局势的影响的，以及探索未知水域的带来挑战和刺激感。
2
In this paper, regarding the influence of infectious diseases on the dynamicsof host populationgrowth, a PDE model is established for the dynamicsof infectious diseases with lifelong immunity.
This paper deduces a theoretical population model in a urban system under a hypothetical condition of zero populationgrowth (ZPG), and analyses the population dynamics for the model.