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。
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。
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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