self closing door

例句：

1. 1.The new security system has a self-closing door that automatically locks when someone enters.
   新安全系统有一个自动锁门功能，当有人进入时会自动锁上。
2. 2. The elderly resident prefers to use the self-closing door for privacy reasons.
   这位老年居民出于隐私原因更喜欢使用自闭门。
3. 3.The self-closing door is designed to prevent unauthorized access to the building's interior.
   自闭门的设计旨在防止未经授权的人员进入建筑物的内部。