plasma density的用法和样例：
例句
- The electron beam can be transported in the unmagnetized plasma for two reasons.
等离子体密度变化过程中，输出存在有峰值功率点。 - The plasma density gratings have been proposed to manipulate high power ultrashort laser pulses, such as speed reduction, pulse stretching and compression.
首次提出了用等离子体密度光栅来对高功率超短脉冲激光进行速度减慢，脉冲展宽和压缩等操纵的理论，并通过数值模拟得以证实。
