There was a big, metal door-knocker on Scrooge's door.
在史高基的门上有一个巨大的,金属的门环。
2
Our doorknocker is cast in solid brass.
我们的门环是纯铜铸造的。
《柯林斯英汉双解大词典》
3
Each oblivious professional was caught on hidden camera as they walked up to the house, where a man had disguised his face as an old, ornate doorknocker.