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A large, valved, brass wind instrument with a bass pitch.
大型带活塞的低音铜管乐器。
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Ostracodes are small animals, most of which have a two valved shell.
介形虫是小型动物，其中大部份都具有两瓣的外壳。
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Ostracodes are small animals, most of which have a two valved shell.
介形虫是小型动物，其中大部份都具有两瓣的外壳。
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