The method calls (events) are queued, guaranteeing order; the next method request in the queue is not sent until the previous one returns.

将方法调用(事件)放入队列，以保证顺序。在队列中，在前一个方法请求返回之前，不会发送下一个方法请求。

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An order from one of WidgetCo's customers is implemented as a list of Widget objects, with one extra method to compute the order's total cost.

来自Widget Co客户之一的订单会作为一个Widget对象列表来实现，并使用一个额外的方法来计算订单的总成本，即。

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The results method calls get_cart, which will retrieve the current Order object or create a new one, if one doesn't exist or cannot be found.

results 方法会调用 get_cart，它会检索当前的 Order 对象，如果不存在或没有找到，就创建一个新对象。

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