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.
BBC紀錄片：暗處的鏡頭——調查中國酒店偷拍影片黑市
，这一点在爱思助手下载最新版本中也有详细论述
这些年她还经常陷入“老年保健品”的套路， 家里至今还堆满她买来的各类“根治”老年慢性病、“延年益寿”的保健品，许多连包装都没拆。她总是抱着“万一有用”的心态，一次次掏钱。
It doesn’t have a steep learning curve
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