Based on use cases, testing can progress on a limited level since use cases only describe the interactions between actors and the system.

基于这些用例，测试可以在一个受限层次上进行，因为用例只描述执行者和系统的交互。

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By designing test cases based on class descriptions, one is able to test the system at a deeper level.

通过设计基于类描述的测试用例，一个人能够在较深的级别上测试系统。

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These application-related table entries differ from system-level metrics in that they are dynamic and are based on the key fields of these tables.

这些与应用程序相关的表条目与系统级指标不同，因为它们是动态的，并基于这些表的关键字段。

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The Alliance Support for High Availability segment engages Microsoft Certified Support Center high-availability providers to offer service-level commitments based on system availability.

CNN: Microsoft hopes to soothe customers with support plan

There were subsequent plans to introduce an admissions system based on actual A-level grades - a so-called post-qualifications applications system - but this was abandoned last year.

BBC: 'Unfair' university admissions claim

We have also worked to develop a nationwide, community-based prevention system that joins stakeholders at every level of government with local organizations that can deliver local solutions.

WHITEHOUSE: The White House