最后，还有一些章节介绍不同技术如何应用在不同的行业中，比如汽车制造、铁路、空中交通控制和通信。

Finally, several chapters are devoted to how the various techniques have been used in various industries, such as automotive, railways, air traffic control, and telecommunications.

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移动通信中手机的机卡分离技术和空中激活技术是实现电信服务与电信终端相分离的重要途径。

The technologies of set-card separation and OTA (Over the Air) are both the important measures in mobile communication systems to realize the separation of the wireless services and terminals.

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讨论了第3代移动通信系统的空中接口安全保护技术，包括数据机密性保护、数据完整性保护。

The air interface security technologies for the protection of data confidentiality and data integrity in 3g are discussed.

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