And, of course, the information Centers remain the primary source for reference information and task-oriented product documentation.
当然，信息中心仍然是参考信息和面向任务的产品文档的主要来源。
Frequency or time is derived from the traffic interfaces except in nodes where a primary reference frequency or time source is provided.
除了在一些节点中提供了主要参考频率或者时间源之外，频率或定时均可从流通接口中获得。
Frequency or time is derived from the traffic interfaces except in nodes where a primary reference frequency or time source is provided.
除了在一些节点中提供了主要参考频率或者时间源之外，频率或定时均可从流通接口中获得。
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