一旦将一行读入模式缓冲区，它就执行' d '命令，然后打印模式缓冲区的内容(在本例中没有内容)。

Once a line was read into the pattern buffer, it performed the 'd' command and printed the contents of the pattern buffer (nothing in this example).

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我们将第二个行读入到模式空间中。

We read a second line into the pattern space.

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推模式最适合边读入边处理XML文档，比如读入rss提要并显示为HTML网页。

The push mode is best suited for processing XML documents on the go, like reading an RSS feed and displaying it as an HTML Web page.

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