a fence made of metal bars that go straight upwards; one of these bars 金属围栏；金属栏杆 
iron/metal railings 铁/金属栏杆 I chained my bike to the park railings. 我用链子把自行车锁在公园的围栏上了。 🔊🔊 She leaned out over the railing. 她靠在栏杆上探出身去。 🔊🔊
Oxford Collocations DictionaryRailing is used after these nouns:- metal
