Kathetron
一种有外栅极的三极管, 辉光放电管
🗣️ 情景例句
She keeps all of her jewelry and valuables in a safe.
她把所有的首饰和贵重物品都放在保险柜里。
Good children make glad parents.
孩子好，父母笑。
Then, jumping into the car, he drove off as quickly as he could.
然后跳进车里，以最快的速度把车开走了。