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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.，更多细节参见WPS官方版本下载
Layoffs have remained limited, apart from some high-profile cuts at firms such as Amazon and UPS and the unemployment rate has held steady at around 4.3%. Meanwhile, the wider economy continues to grow, expanding at a robust annual pace of 4.4% in the most recent figures.，更多细节参见同城约会
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