它们的主要区别是，访客总是在某个时刻才提出，因此（通常）没有必要详述背景环境。
The main difference is that the visitor is always in the moment, so there is (usually) no need to specify context.
这两者之间的主要区别是传递不同的参数，所以您的确需要同时配置它们。
The major difference between the two involve different parameter passing, so you really need to configure both.
两个前端控制器之间的主要区别是它们如何决定处理具体请求的动作。
The main difference between the two front controllers is how they determine the action that processes a particular request.
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