1. They permit access to external service from within the internal network 
   它们允许从内部网络以内访问外部的服务
2. A bridge that can be raised or drawn aside either to prevent access or to permit passage beneath it. 
   吊桥可以提升、放下或拉到边上以便通行或阻断的桥
3. Hardware or software features,operating procedures,or management procedures designed to permit authorized access and prevent unauthorizedaccess to a computer system. 
   为使某一计算机系统允许受权者和防止未受权者使用而设计的硬件或软件的特性、操作过程或管理过程。
4. A badge of personal identification worn to permit access to areas, such as government installations or industrial plants, or gatherings, such as conventions or sales meetings. 
   标志一种戴在身上的证明个人身份的标志，使得进入某些地方，如政府军事基地或工业设施，或集会，如会议或展销会
5. In word processing, a word to be typed in at the work station to identify the operator and permit access to the system or toa specific document. 
   字（词）处理技术中，在工作站上键入的一个字，用来识别这个操作员准许他访问该系统或某个特定的文件。

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• 1. 进入许可证
  access control private 特权访问控制...access permit 进入许可证...access program 存取程序
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