The goal of model Two is system optimization or minimizing total travel time.

模型二是以系统最优即系统总行驶时间最小为目标。

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Theoretical model, we introduce the Gordon growth model, two-stage growth model, three-stage growth model;

理论模型中，介绍了永续增长模型、两阶段增长模型、三阶段增长模型；

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Vitreoretinal Instrument Handle, Squeeze Model, Two Finger Control Hdl, Rnd Titanium.

玻璃体视网膜器械手柄，挤压式，双指控制手柄，圆形，钛合金。

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Vitreoretinal Instrument Handle, Squeeze Model, Two Finger Control Hdl, Rnd Titanium.

玻璃体视网膜器械手柄，挤压式，双指控制手柄，圆形，钛合金。

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