We added access keys, links to certain major sections of the content layout, and headings to identify these major sections.
我们添加了访问键、到内容布局的某些主要部分的链接以及标识这些主要部分的标题。
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Another major enhancement is the support for generating primary keys.
另一个主要增强是支持生成主键。
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Though symmetric keys have their disadvantages (primary among them being how to pass them among the trusted parties), the major advantage they offer is speed of encryption and decryption.