Mary: Let's say you have a document that's several pages long, the multi-sheet feeder will feed the pages one at a time.
玛丽：假如您要复印的文件有好几页长，“多页复印”可以一次性将复印的资料承载下来。
Mary: Now, take it easy! Maybe you're doing something wrong. Do you want to use the multi-sheet feeder?
玛丽：慢慢来吧。或许您操作得不对。您使用“多页复印”了吗？
The principle of the relay protection of multi-car's DC traction supply system and the several DC feeder protection methods were presented.
介绍了地铁直流牵引供电系统保护的原理，和所采用的几种直流馈线保护方法。
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