The result shows that the edged sampling mirror and the edged vacuum window can be treated as a pair of prisms, which generates negative group velocity dispersion.
分析结果表明，带楔角的取样反射镜与后续光路中使用楔形真空窗口构成了一对棱镜，产生负的群速度色散。
Three weeks ago Capello exploited a power vacuum at the Football Association to remove a clause in his contract, which gave both sides a two-week window to sever their deal.
三个星期前，卡佩罗利用英足总的权利真空，删掉了他合同中的一个条款，结果就是给予了双方为期两个星期的窗口期来终止他们之间的合同。
But experience has taught the physicists never to open a window because, when they do, all the air rushes out and leaves the room a vacuum.
但是经验告诉物理学家们不可以打开任何一扇窗子，不然空气就会冲出去，使房间变成真空。
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