Bille and his team work with an optical instrument called an active mirror—a device used in astronomical telescopes to spot newly emerging stars and far distant galaxies.

比尔和他的团队使用一种被称为“活动镜”的光学仪器，这是一种在天文望远镜的种类中用来发现新出现的恒星和遥远星系的仪器。

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And for many of us, that threshold is drawing nearer, or already a distant smirch in the rear-view mirror.

而对于我们许多人来说，这个门槛是越来越近，或许早已向汽车后视镜上的污点，看起来我们以为很远，实际上却近在咫尺。

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The image formed by a plane mirror has the same size as the object. it is also equally distant from the mirror as the object.

利用平面镜观看镜像，镜像的大小与物体相同，并且两者与镜面的距离相等。

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In this new battleground in the cultural wars of the Muslim world, a distant mirror of the religious wars that shook Europe in the 15th and 16th centuries, Malian musicians are taking a stand.

CNN: Mali's conflict turns musicians into military