| 单词 | 石定 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔particle beam〕A beam of atoms or subatomic particles that have been accelerated by a particle accelerating device, aimed by magnets, and focused by a lens.粒子束流：一束由粒子加速器加速过的原子或亚原子粒子，用磁石定方向，用透镜集中美国传统 |
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