相对于即使大批量通信，书有另外一个优点，那就是：你无法关闭它。
Books have another, competitive advantage over instant mass communication: they can't be turned off.
许多用户选择关闭这些邮件提醒——因为如果你有5个以上的脸书好友，那么你收到脸书的邮件的次数可能比真人发给你邮件的次数还多。
Many users choose to turn these E-mail alerts off — because, if you have more than about five Facebook friends, you might get e-mails from Facebook robots more often than from humans.
他关闭了书，标示他的页，而且放它在他旁边的桌子上。
He closed the book, marking his page, and placed it on the table beside him.
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