Pnpndiode
[电] PNPN(四层)二极管
🗣️ 情景例句
She has a clear head.
她头脑清晰。
There is nothing which has not been bitter before being ripe.
事情在成功前没有不艰苦的。
who produced it with a flourish and pointed out a microscopic 'o' beside the time of the arrival of the train at his station;
站长拿着时刻表一挥手，指着那趟列车到站时刻旁边一个很小的圆圈标记。