valved造句
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.
A large,
valved, brass wind instrument with a bass pitch.
大型带活塞的低音铜管乐器.
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 ?