service gate

例句：

1. 1.The service gate is a crucial part of the security system.
   服务门是安全系统的关键部分。
2. 2.The service gate was designed to prevent unauthorized access.
   服务门被设计来防止未经授权的进入。
3. 3. The service gate is where visitors can enter the building without being identified.
   服务门是访客可以不被发现地进入大楼的地方。