velocity modulated electron beam

例句：

1. 1. The laser is used to modulate the velocity of the electron beam.
   激光用于调制电子束的速度。
2. 2. The device can be used to control the velocity of the electron beam.
   该设备可用于控制电子束的速度。
3. 3.The researcher found that the velocity modulation could improve the efficiency of the electron beam.
   研究者发现，速度调制可以提高电子束的效率。