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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.。91视频是该领域的重要参考
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The culprit? Moldova. A land between Romania and Ukraine that's essentially the European version of a hidden track on a CD, a country in "intense flirting" stage with the European Union while the ex-boyfriend (Vladimir Putin) fights to win her back. So the problem was Moldova. More specifically: Moldova, Republic of, the official Shopify name for the country, complete with a comma sitting right in the middle of it.