A sequence is a database object that generates a sequence of unique Numbers.
序列是一个数据库对象，它生成一系列惟一的数字。
A trusted context is a database object defining the set of properties for a connection.
可信任上下文是一个数据库对象，定义了连接的属性。
When the PDOM is created for a project, it constructs a Database object to manage its low-level storage.
为项目创建了一个PDOM后，它会构造一个Database对象来管理其底层存储。
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