The process of doing this is known as guarding a section. The first and last sections of a heavy reference work may be guarded in this way.

一本厚书的最先和最后的书帖就需用这个称为书帖护脊的方法处理。

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The process of doing this is known as guarding a section. The first and last sections of a heavy reference work may be guarded in this way.

一本厚书的最先和最后的书帖就需用这个称为书帖护脊的方法处理。

youdao