Cut - in index: Divisions cut into edge of book to indicate alphabetical steps . Also called Step index.

梯级形索引: 书本切口旁边,顺着字节次序切成梯级形状.

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Cut - in index: Divisions cut into edge of book to indicate alphabetical steps Step index.

梯级形索引: 书本的外白边,从头至尾,像梯级的分部分割去,显示字母次序的索引.

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