自然粒子加速器特别有趣，因为它们是可以观察到在气体中发生电子雪崩的唯一场所。
Natural particle accelerators are particularly interesting, because they are the only places where electron avalanches in a gas can be observed.
衣阿华州立大学设有一台线性加速器，连往屠宰场，另外还有一间实验室，研究人员可以在其中检查辐照产品。
Iowa State University operates a linear accelerator attached to a slaughterhouse and a lab where researchers can examine the irradiated products.
研究人员认为在尾迹场加速器中不可能这么精准的注入电子，因为加速的过程是微观而且短暂的。
Researchers thought that such precise injection was impossible in a laser wakefield accelerator because the accelerating structure is microscopic and short-lived.
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