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Second, double-clicking the closed model will open it.

接下来，双击这个封闭模型将它打开。

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This closed model allows Velocity to provide a decoupled templating presentation layer, cleanly separated from any application business logic or data management code.

这种封闭的模型使Velocity能够提供分离的模板表示层，与任何应用程序业务逻辑或者数据管理代码清晰地划分开。

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Outside the U.S., Amex has taken a step away from its closed loop model where it issues its own credit cards and also acts as the acquirer for merchants accepting the card.

FORBES: Quick Take

There are many areas of overlap between biomimicry and "cradle-to-cradle" particularly in the way that ecosystems present a great model of closed loop systems in which any waste from one organism becomes the nutrient for something else.

CNN: STORY HIGHLIGHTS

American Express has successfully implemented its spend-centric model and closed-loop network to achieve growth over the last few years and was one of the few financial companies to come out of the economic crisis of 2008 virtually unscathed.

FORBES: Quick Take