externally excited Van de Graaff generator

例句：

1. 1. The externally excited Van deGraaff generator is used to generate high-energy electron beams for scientific research.
   外部激发的范德格拉夫发电机用于产生高能量电子束，用于科学研究。
2. 2.The externally excited Van de Graaffgenerator has been proven to be an effectivetool for particle acceleration.
   外部激发的范德格拉夫发电机已被证明是粒子加速的有效工具。
3. 3. The externally excited Van deGraaff generator is a crucial component inthe development of new materials and technologies.
   外部激发的范德格拉夫发电机是新材料和技术发展的关键组成部分。