These are properties of the system that aren't described as use cases but usually have a great impact on them, involving the system's usability, reliability, performance, and supportability.

这些需求是不是通过用例来描述的，但他们通常是对系统有很大影响的系统特性，包括系统可用性，可靠性，系统性能和可支持性。

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It is one of the key challenges of software development that quality properties such as performance or reliability are only measurable after implementation availability.

摆在软件开发者面前的关键问题之一就是质量控制，例如当评价完可行性之后，性能和可靠性就是仅有的两个衡量指标。

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Designing within this constraint promotes the system properties of visibility, reliability, and scalability.

符合这一约束进行设计可以提高系统的可见性、可靠性和可伸缩性。

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