Bindings 接口只是一个 Map 接口，用于强制关键字为字符串。

The Bindings interface is just a Map interface that enforces keys to be strings.

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类似地，Google Book Search还允许用户使用描述性的关键字为每本书设置标签。

In a similar vein, Google book Search also allows users to tag, or "label", each book with descriptive keywords.

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演讲稿的大部分内容由他亲自撰写，言辞颇具学术风范，长约四千字，为他就职演说长度的近两倍。

He crafted much of the address himself and the scholarly remarks - at about 4,000 words - were nearly twice as long as his inaugural address.

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