valveKK [vælv] /vælv/发音名词1阀门、活门、凡而Turn off the main valve before you replace the old pipe.更换旧水管之前,要先关掉总阀门。2瓣膜医学The surgeon replaced a damaged valve in the patient's heart.医师为病人置换了受损的心脏瓣膜。3按键、活塞音乐He pressed the second valve to lower the note a semitone.他按下第二个按键,把音降低半音。4真空管、电子管英式、旧式Old radios used valves instead of transistors.早期的收音机用的是真空管,而不是电晶体。用这个字练口说→