Fexitron
冷阴极脉冲X射线管
🗣️ 情景例句
Now, how's the Stewart family?
那么， Stewart全家人都好吗？
This is a radio.
这是一台收音机。
If we could actually see the path described by a particle,such as a sand grain in the rock,
假如我们真能看到的运动轨迹，诸如岩石中一个沙粒分子