快照可以同时与不止一个流或者工作区一起记住；一般的模式是，将“受关注的”快照与相关的流联系以来。

Snapshots can also be remembered with more than one stream or workspace; it is a common pattern to associate "blessed" snapshots with the stream to which they are related.

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Spark具体类并不象大多数继承模式中的类那样仅仅重新定义或添加特定的方法，而是具有两种特性(一般的模式与各阶段和各种父模式都一样)。

Rather than merely redefining or adding specific methods as in most inheritance patterns, Spark concrete classes have two features (the general pattern is common to the stages and various parents).

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我们将检查数据中的一般模式，并向您展示如何使用 R 找到它们。

We will examine general patterns in the data and show how to find them by using R for you.

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