For more flexible development, we design a second-development component for our system.
系统还提供了可扩展组件，以便二次开发，增加了系统灵活性。
The second chapter is to introduce the system development models and tools;
第二章是介绍系统的开发模式和工具；
The second chapter is to introduce the system development models and tools;
第二章是介绍系统的开发模式和工具；
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