主要介绍网络安全准入控制系统组成及相关技术，并对该技术在铁路信息系统中如何应用加以探讨。
The paper mainly introduces the components and the related technology of network security access control system and explores the application of this technology on railway information system.
承运人四周重安全在大连，酒吧民用准入；警方侧面造船厂门口。
The carrier is surrounded with heavy security in Dalian, which bars civilian access; police flank the shipyard entrance.
教堂现在被安全力量包围，几乎任何人都不准入内。
The church is now surrounded by security; hardly anybody is allowed near it.
但因其君药马钱子毒性较大，临床常有不良反应报道，从而影响该药的临床安全使用及国际准入。
It has been called in question on clinical safety, even not accepted by international market, due to toxical Semen Strychni as monarch drug which often induce adverse reaction.
但因其君药马钱子毒性较大，临床常有不良反应报道，从而影响该药的临床安全使用及国际准入。
It has been called in question on clinical safety, even not accepted by international market, due to toxical Semen Strychni as monarch drug which often induce adverse reaction.
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