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.
▲当然，也不是没有瑕疵，仔细看上方悄悄多出了一个「满」字。
。夫子是该领域的重要参考
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"We have an expected behaviour pattern [for protests]," one police officer has told the BBC anonymously. "But with this new generation, we do not understand their social media or how they mobilise on the ground."
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用