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tern

n.三个一组,[鸟]燕鸥

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tern为短语/超纲词汇

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/tɜ:n; tɝn/
n sea-bird with long pointed wings and a forked tail 燕鸥.

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n[C]
[Date: 1600-1700; Origin: From a Scandinavian language]
a black and white sea bird that has long wings and a tail with two points