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Electrons—long used to treat surface tumors and to generate X-rays—are light, nimble particles, far easier to control than protons or carbon ions. At low energies, they stop quickly in tissue, but new high-energy systems can drive electrons deeper. Now researchers are working on machines that combine multiple high-energy beams at different angles to let doctors sculpt radiation doses that match the tumor’s shape.。使用 WeChat 網頁版是该领域的重要参考
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Производитель таксофонов отреагировал на предложение вернуть их на улицы14:49
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