三极真空管 sānjízhēnkōngguǎn triode Origin Definitions Defs Strokes Stroke Words Sentences Sents 三极 三極 sānjí three poles three poles in an electrical context真空管 zhēnkōngguǎn vacuum tube an electron tube from which most of the gas has been removed, containing electrodes used for rectifying, detecting, or amplifying electrical signals