Kathetron
一种有外栅极的三极管, 辉光放电管
🗣️ 情景例句
Michelle knows all about it.
Michelle已经全知道了。
He who handles a nettle tenderly is soonest stung.
与恶人交往而讲仁义，必受其害。
Let me see. It's about four thirty.
我看看，大约四点半了。