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.
如果你正在移植z轴指向上的左手系建模应用程序，你就必须将所有的顶点数据做上述的处理。
If you are porting a left-handed modeling application where the z-axis points up, you must do a rotation on all the vertex data in addition to the previous steps.
空姐：好的，按你左手边的按钮就可以了，此外，请系好安全带。
Stewardess: Sure. Just press the button on your left hand. Besides, fasten your belt.
纵波位移是极向量，在坐标系由右手坐标系变成左手坐标系（或相反）时，不改变位移方向；
P-wave displacement is a polar vector, and its direction remains unchanged when we move it from right hand coordinate system to left hand coordinate system(or in the opposite way).
纵波位移是极向量，在坐标系由右手坐标系变成左手坐标系（或相反）时，不改变位移方向；
P-wave displacement is a polar vector, and its direction remains unchanged when we move it from right hand coordinate system to left hand coordinate system(or in the opposite way).
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