Emitron
[电] 阴极发射管
🗣️ 情景例句
Where do you go to school?
你去哪里上学？
Don't answer back.
不要顶嘴。
And anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bed was flat.
凡是稍稍想过大海海底的人大概都会认为海底是平坦的。