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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語言學習對長遠的大腦健康與幸福感有明顯益處，這點早已廣為人知，因此我對此從無遺憾。但我念了四年語言學位、花了無數時間在動詞變化、死背單字——這樣的學習方式是否已經過時了？
"Through organ donation, she has given other families the precious gift of time, hope, healing and now life," her family said.