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.
辞典例句
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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Q 20 : Can a valved respirator be used for protection from the virus that causes H 1 N 1 influenza?
问20:可以用带呼气阀的呼吸防护口罩防甲型(H1N1)流感病毒 么 ?
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