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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儘管《安靜復興》背後的數據受到質疑,英國的確在某些地方出現基督信仰回升的跡象。
* @param {string} num 非负整数的字符串形式(可能含前导零)