ring rail

例句：

1. 1. The old house has a beautiful ringrail around the courtyard.
   这所老房子有一个漂亮的环形栏杆环绕着庭院。
2. 2.The new playground is surrounded by a ringrail for safety reasons.
   为了安全原因，新的操场周围有一圈环形栏杆。
3. 3. Thecar was parked in front of aring rail, blocking the way.
   汽车停在了环形栏杆前面，挡住了去路。