在硬件系统的设计中，采用模块机制，各模块之间予以一定的通信协议进行通信，使系统更易维护和升级。

In the hardware system, module mechanism is used, and some communication protocols are adopted between modules if interaction is required, which make the system easier to be maintained and upgraded.

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在此系列文章的第3部分中，我们向您介绍了服务组件体系结构(SCA)导入和导出，并侧重介绍了如何将它们用作集成sca模块的机制。

In Part 3 of this series, we introduced you to Service Component Architecture (SCA) imports and exports and focused on using them as a mechanism to integrate SCA modules.

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PAM还提供了通过PAM服务模块与现有验证机制集成的灵活性。

PAM also provides flexibility to integrate their existing authentication mechanism with PAM service module.

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