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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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Американские сенаторы захотели принудить Трампа прекратить удары по Ирану14:51，详情可参考体育直播
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第三，宠物行为带来的不确定性风险。