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keychain

noun
🔊/ˈkiːtʃeɪn/
🔊/ˈkiːtʃeɪn/
(especially North American English)
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  1. a small chain, often attached to a metal ring and a decoration, that you use to hold keys together
    • I brought him back a nice keychain as a small memento of my visit. 我把他带回了一个不错的钥匙扣，作为我这次访问的小纪念品。