The customer wanted to keep two separate instances in each environment in order to isolate their systems since they were running different applications with two different databases.

因为要运行不同的应用程序，且带有两个不同的数据库，客户还需要在每个环境中建立两个的实例用以隔离其系统。

youdao

In contrast to a system container, an application container only creates separate namespaces needed to isolate a single application. To start an application container.

与系统容器相比，应用程序容器只是创建用于隔离一个应用程序的单独的名称空间。

youdao

So you might want to separate the dog, isolate the dog from people the dog perceives as a threat.

NPR: The Ethicist: Weighing a Canine Conundrum