Adding a mock is the final step in designing this system for maintainability.
添加一个模仿类是设计可维护性的系统的最后一个步骤。
The system is a low cost open system , safe and reliable and has good maintainability.
系统安全可靠，成本低，开放性好，易于维护。
The system is a low cost open system , safe and reliable and has good maintainability.
系统安全可靠，成本低，开放性好，易于维护。
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