They are compact for most data, have fast lookup, and allow fast Boolean operations.
它可以压缩大部分数据，可以快速查找，而且支持快速的boolean操作。
The hardware design of security policy database (SPD) and security association database (SAD) which are suitable for fast lookup.
适应快速查找需要的安全协议数据库(SPD)和安全关联数据库(SAD)的硬件结构设计。
You could use a List or a Map to implement the relationship; however, a Map offers the advantage that it can provide fast lookup given, say, the book catalog number as the key.
可以用List或Map实现这个关系；但是Map提供的优势是它能提供快速的查询，也就是说用图书目录编号作为键。
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