它针对服务的执行方式定义了服务水平协议(SLA),令使用者和提供者都能明白他们所受的限制和抱有的预期。
It defines the service-level agreements (SLAs) for how services should perform, so that both the consumers and the provider know their limitations and expectations.
操作无方向限制,令使用者方便,灵活,感觉更体贴。
There is no directional limit on the operation, so that the use can be more convenient, flexible and comfortable.
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