每个集群实例也是连接第三个实例的异构分布式系统中的一员。
Each cluster instance is also a member of a heterogeneous distributed system that connects with a third instance.
第三个步骤是实际开发(或使用)连接到数据库的应用程序。
The third step is actually developing (or using) applications that connect to the database.
另外一个钻孔用来提供通讯连接，第三个用以通风。
Another one provides a communications link and the third is to provide ventilation.
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