- 释义：
- n. 敲击的人; 门环; 挨户敲门的推销员; 上门推销员
- 例句：
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Number 30 has a red door and a brass knocker.
30号有一扇红门和一幅铜门环.
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The knocker is oblong in shape, and of the kind our ancestors called " jaquemart ".
铁锤是长方形的, 象 古时 的钟锤.
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His residence has amenities like a pull - bell and a door knocker.
他的住宅设施如拉 —— 有一门钟,海浪.
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