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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再说客人，当年，迎面过来一个客人，打声招呼，塞给妈咪的小费就有一千多块。1990年，一个台湾客人包走了Maggie姐手下的一个女孩子，又怕她有损失，塞给她五六万块钱，还邀请她和家人去台湾玩了一趟。“现在连小费都不给，客人的素质越来越差了。”Maggie姐感叹道。
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