Abstract: in this paper, a 2-dimension, nonlinear birth-death prey-predator model is established.

摘要：本文建立了一类二维非线性生灭捕食——被捕食模型。

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What we study is a kind of prey-predator model with epidemic spreading in it based on agents' interactions.

我们研究的是一类基于个体相互作用的带有传染病的捕食者与被捕食者模型。

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The pair were inspecting two 60-footers that their company would take delivery of, including a sleek, black Predator model costing about 20 million Hong Kong dollars ($2.6 million).

陈的公司购买了2艘60尺长的游艇，额外还有一个表面光滑的黑色“掠夺者”模型，价格在2000万港币左右。

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Dr Webb's model shows that, over a 200-year period, average predator populations during hypothetical outbreaks of 14- and 15-year cicadas would be up to 2% higher than during outbreaks of 13- and 17-year cicadas.

ECONOMIST: The 17-year cicadas are about to emerge in force