受信任的主机：数据库根据连接请求的来源确定是否信任这个主机。
Trusted hosts: the database assumes trust based on the source of the connection request.
当创建该数据库时，该信任存储区由商业证书颁发机构提供的一套缺省密钥填充。
When the database is created, the trust store is populated with a default set of keys from commercial certificate authorities.
可信任上下文是一个数据库对象，定义了连接的属性。
A trusted context is a database object defining the set of properties for a connection.
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