valveKK [ˋvælv] /ˈvælv/名詞1閥門、活門、凡而Turn off the main valve before you replace the old pipe.更換舊水管之前,要先關掉總閥門。2瓣膜醫學The surgeon replaced a damaged valve in the patient's heart.醫師為病人置換了受損的心臟瓣膜。3按鍵、活塞音樂He pressed the second valve to lower the note a semitone.他按下第二個按鍵,把音降低半音。4真空管、電子管英式、舊式Old radios used valves instead of transistors.早期的收音機用的是真空管,而不是電晶體。