Of or pertaining to a system that controls of access to a particular area.
行业： 安全防护
a phrase used to introduce a contradictory statement
一个国家的一些过程中所产生的事务
（当事件发生时） 未经警告或制备
东西，给其中一个比另一个更好或优越的位置
involving the possibility of adverse or unwelcome circumstance
Refers to events that occur during the day
Appearing or active at twilight.
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