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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The Netherlands' quiet embrace of the four‑day working week has captured international attention. Dutch employees work an average of 32.1 hours per week, the lowest in the EU, and well below the bloc's average of 36 hours.
（图源：长春高新 2021 年年度报告）
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Kosmos 482, which launched in 1972 on a mission to Venus, never made it out of Earth's orbit and instead broke into four pieces that have been circling the planet for more than five decades.
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