As you can see, a line is printed for each book block.

可以看到，每个图书块输出一行。

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Self-ends: First and last pages of a book block used as end papers.

自衬页：书心的首页和尾页作衬纸用有情况。

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Finally, using the foreach loop, the script loops around each book block and picks out the author, title, and publisher.

最后用foreach循环，在每个图书块间循环，并提取出author、title和publisher。

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If a card belonging to a Berliner has never been used to purchase a plane ticket or buy goods outside Germany, the system may block an attempt to book a Moscow-Tokyo flight leaving in three hours.

ECONOMIST: Computing

Restaurants use an electronic reservation book, and customers have access to its full inventory (though a block of tables can be set aside for unannounced regulars and celebrities).

CNN: Online restaurant reservations really do work

Using standard laboratory gene synthesizing equipment, they made almost 55, 000 strands of DNA, each containing a portion of the text and an address block, indicating where it occurred in the flow of the book.

FORBES: What if Big Data is Too Big? A Radical Solution May Be in DNA