Febetron
冷阴极脉冲, β射线管, 相对论性电子发生器
🗣️ 情景例句
Oh, yes. It's definitely worth reviewing.
噢 是的 。它着实值得评论。
How many cups are you going to order?
你要订几杯？
He was smiling hopefully.
他满怀希望地微笑着。