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.
我永远不会忘记第一次与乔布斯的谈话。当时苹果正在谷底挣扎，史蒂夫试图扭转局势。很多人怀疑公司能否存活。有人警告我，加入苹果的风险巨大。
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For instance, and this would be very, very bad: a puncture wound.
Parsimonious deep neural network models can be used for prediction of visual neuron responses.