Most caches are implemented using the Singleton pattern involving a static reference to a top level cache class as shown in this example.

使用Singleton模式实现的大多数缓存都涉及本例所示的对顶级cache类的静态引用。

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The name server checks its database and cache, doesn't find anything, and sends an iterative request to a root server for the .com top-level domain.

该名称服务器检查其数据库和缓存，没有找到任何结果，于是向 .com 顶级域的根服务器发送一个迭代请求。

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You will find that we page cache four of the six top level menu choices.

您会发现我们会页面缓存六个顶端菜单中的四个。

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