They also needed an alternative to conventional X-rays. In a clinical linac, X-ray photons are produced by dumping high-energy electrons into a bremsstrahlung target, which is made of a material with a high atomic number, like tungsten or copper. The target slows the electrons, converting their kinetic energy into X-ray photons. It’s an inherently inefficient process that wastes most of the beam power as heat and makes it extremely difficult to reach the ultrahigh dose rates required for FLASH. High-energy electrons, by contrast, can be switched on and off within milliseconds. And because they have a charge and can be steered by magnets, electrons can be precisely guided to reach tumors deep within the body. (Researchers are also investigating protons and carbon ions; see the sidebar, “What’s the Best Particle for FLASH Therapy?”)
目前，小米尚未开启汽车出海业务，但欧洲已经被确定为该业务的首站。去年12月，小米品牌总经理卢伟冰发布视频表示，欧洲是全球汽车最难的市场，小米希望在此立足之后，再进入其他市场。此前，他还曾透露进军欧洲的时间是2027年。
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第一百五十一条 承租人向出租人交还船舶时，该船舶应当具有与出租人交船时相同的良好状态，但是船舶本身的自然磨损除外。