Often a good, representative category system can be drawn from other systems.
良好的具有代表性的分类系统往往是从其他系统衍生出来的。
The smallest but most important category of computer systems for end users.
最小的，但最重要的一类计算机系统，为最终用户。
Home and business security systems and certain computer software and hardware fall into this category.
家用和商用安全系统及某些计算机软件和硬件都属于这类。
Normal And Utility Category Airplane Electrical Wiring Systems;
正常和实用类飞机的电线系统；
Normal And Utility Category Airplane Electrical Wiring Systems;
正常和实用类飞机的电线系统；
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