The operation of reading from a file is very straight forward, we open a file stream, create an array to hold the data, and finally read all the data into the array.

从文件中读取内容的操作是非常直截了当的：我们打开一个文件流对象，创建一个数组来放置数据，最后把所有数据都读到这个数组中。

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The need for such an operation is brought about by the recognition that there is something valuable to move into another stream.

当您意识到需要将一些有价值的东西移动到另一个流中时，就需要这种操作了。

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Back to the propagation operation: this is yet another example of propagation from a parent stream to one or more child streams.

回到传播操作：这是从父流程到一个或者多个子流程传播的又一个范例。

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