Why is marking a book necessary? Because it keeps you awake.
为什么在书上做标记是必要的？因为它会让你保持清醒。
Genetic marking is the equivalent of giving every book a title, table of contents and index-and with much greater speed and accuracy than any librarian could manage.
基因标记相当于给每本书起名，建立内容目录和索引，而且其速度和准确度是任何图书管理员都无法做到的。
I contend, quite bluntly, that marking up a book is not an act of mutilation but of love.
坦率地说，我认为，在书上涂抹标记不是一种损毁行为，而是爱。
These are all kinds of devices for marking a book intelligently and fruitfully.
在书上作记号，有各种各样好的、行之有效的方法。
"I have been with him going on four years, Master Copperfield." said Uriah, shutting up his book after carefully marking the place where he had left off.
“我跟了他也有四年了，考勃菲尔少爷。”犹拉阿说着，一面合上书，细细地先标过读到哪了。
Whenever necessary, I would do some marking in the book, using colour pens and even taking down notes in a separate exercise book for future reference.
必要时，更在书本上做记号，用彩色笔加上五颜六色，甚至在本子上另做笔记，以备日后参考。
Whenever necessary, I would do some marking in the book, using colour pens and even taking down notes in a separate exercise book for future reference.
必要时，更在书本上做记号，用彩色笔加上五颜六色，甚至在本子上另做笔记，以备日后参考。
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