同义词： knocker doorknocker rapper
以上来源于: WordNet
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。
Our door knocker is cast in solid brass.
我们的门环是纯铜铸造的。
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 door knocker.
每个专业推销员在走向这所房子时，都在不知不觉中被隐藏的摄像机拍了下来，而这所房子的门环，看上去古老又华丽，却是人脸伪装的。
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