To obtain high average current electron beams for high average power Free Electron Laser (FEL), a DC-SC photocathode injector is designed.是什么意思_To obtain high average current electron beams for high average power Free Electron Laser (FEL), a DC-SC photocathode injector is designed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句