The Visitor pattern creates a scenario where adding operations (new visitors) over the set of existing data types is easy.
访问者模式将创建一个场景，简化对现有数据类型集合添加操作（新访问者）的过程。
Adding new data types (classes) with visitors is difficult, however, as the visitor pattern requires a visit method for all concrete types.
然而，通过访问者添加新数据类型(类)较为困难，因为访问者模式要求所有具体类型都具有一个visit方法。
It is not hard to integrate a pattern-matching library with the tree visitor to get to a point where visitors can leverage tree patterns.
您可以轻松集成模式匹配库与树访问者，使访问者能够利用树模型。
In the exhibition we will showcase the most advanced automatic vehicle number plate recognition system and pattern recognition system to all our valued visitors.
在本届展览会上，我们将向所有参展的来宾现场演示最先进的车牌号码自动识别系统和图像识别系统。
The intricate pattern is visible from the air and visitors can use huge platforms located around the maze to try to plot a route through the web.
从空中看，这个复杂的模型很显眼，参观者能够在一个巨大的平台找到迷宫的路线图。
This pattern of behavior influences cut-down cash sales and the number of visitors in traditional restaurants in Slovakia.
这饮食习惯影响了在斯国的传统餐馆生意，现金收入以及顾客都因而减少。
The discrepancy between regions heavily affected by the EHEC within Germany and major destinations for visitors may explain the relatively localized pattern in the outbreak.
德国主要疫区与外国旅客偏好的联邦州的差异可解释为何是次爆发大体上只局限于德国本土。
The discrepancy between regions heavily affected by the EHEC within Germany and major destinations for visitors may explain the relatively localized pattern in the outbreak.
德国主要疫区与外国旅客偏好的联邦州的差异可解释为何是次爆发大体上只局限于德国本土。
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