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- a seabird related to the gulls, typically smaller and more slender, with long pointed wings and a forked tail燕鸥。
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- Family Sternidae (or Laridae): several genera, in particular Sterna, and many species.燕鸥科（或鸥科）：数属, 尤指燕鸥属, 多种。
词源
late 17th cent.: of Scandinavian origin; related to Danish terne and Swedish tärna, both from Old Norse therna.