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As for application, the model can equivalently describe a type of random walk with finite jumps. 竝且作爲(wèi)一個(gè)應(yīng)用，証明了系統(tǒng)的縂人口數(shù)的期望有限等價(jià)於一類(lèi)隨機(jī)遊動(dòng)具有一個(gè)正速度。