PN is a common but complex entity.
肠外营养是一种常见而复杂的实体。
There is also a northward current at the eastern most part of Section PN.
在PN断面最东部分，也存在一支北向流。
This paper presents a PN-based description method of control system.
介绍了一种基于PN的控制系统描述方法。
This paper presents a PN-based description method of control system.
介绍了一种基于PN的控制系统描述方法。
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