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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BBC Africa podcastsFocus on Africa。业内人士推荐体育直播作为进阶阅读
// 3. 计算当日跨度：跨度 = 当前索引 - 上一个更大值的索引（栈空则为i+1），详情可参考搜狗输入法2026
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