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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，更多细节参见同城约会
premium version with more advanced features such as plagiarism detection
但a16z的美国活力团队今年集体转向，旗帜鲜明地押注物理世界的重建。
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