优秀设计的关键因素之一就是注意保持系统的可维护性。
One of the keys to good design is keeping an eye on 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。
Adding a mock is the final step in designing this system for maintainability.
该系统功能力图易于使用，具有较高的扩展性和可维护性。
This system performance to easy to use, has high expansibility and maintainability.
该系统功能力图易于使用，具有较高的扩展性和可维护性。
This system performance to easy to use, has high expansibility and maintainability.
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