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Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.
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Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36
线下渠道商面临提货价上涨与消费者接受度下降的双重压力。随着3月后新品陆续上市，销售难度大增，可能引发一轮关店潮。