This article discusses the hybrid system model of each layer and gives a detail description for the process layer. Petri net approaches are presented to model chemical control hybrid system.

论文分别讨论了各层混杂系统的模型形式，特别对过程控制层混杂系统模型进行了详细的描述。

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This paper introduces the main retrieval approaches to the resource of English language and literature on the Internet, as well as some of the important net resource.

论文介绍了在因特网上检索英语语言文学信息的主要途径，以及英语语言文学方面的重要网络资源。

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The process characteristics of S-Net, a kind of structure-simple Petri net, are analyzed firstly with details, and the approaches to ob.

文中首先考察结构简单的S-网的进程行为，给出各种类型的S-网的进程表达式的描述方法。

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John McEnroe, the three-time Wimbledon singles champion and ESPN analyst, said he sees signs of aging when Federer approaches the net.

WSJ: Wimbledon 2012: Roger Federer's Wimbledon Bluff

He let the advantage slip but his ability to mix up both his serve and his approaches to the net continued to confound Hewitt and after breaking again at 3-3 he duly served out the set.

BBC: Hewitt breaks Henman resolve

Abandoning an automatic credit for biogenic carbon is the only way to define a consistent GHG accounting framework without resorting to unverifiable assumptions about the extent of net carbon uptake that complicate other approaches, DeCicco argues.

FORBES: Rethinking Life-Cycle Fuel Regulations