如果是在一个习惯左手系的星球上，那样我们的习惯会完全相反，就是这样了。
If we had been on the planet with left-handed coordinate systems then actually our conventions would be all the other way around, but they are this way.
从几何光学理论证明了，在左手系材料（负折率材料）透镜中存在完善聚焦的概念。
The perfect focusing concept is proposed in lenses made of Left handed materials (or negative index materials) by means of geometrical optics.
虽然左手系和右手系都是很常用的系统，但是也有很多其他种类的坐标系用于3-D 软件。
Although left-handed and right-handed coordinates are the most common systems, there is a variety of other coordinate systems used in 3-D software.
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