thermionic valve編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看thermionic valvethermionic valve — 名詞名詞1. a device that controls electric current using heated electrons in a vacuum1.名詞釋義熱離子管a device that controls electric current using heated electrons in a vacuum例句Old radios used thermionic valves before transistors were invented.