The universal cover of the double doughnut is a hyperbolic space, where we only shrink the xy plane, but not the height
At Germany’s Photo Injector Test Facility in Zeuthen (PITZ), the electron-beam accelerator [top] is used to irradiate biological targets in early-stage animal tests of FLASH radiotherapy [bottom].Top: Frieder Mueller; Bottom: MWFK，详情可参考WhatsApp Web 網頁版登入
。业内人士推荐谷歌作为进阶阅读
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