右不变性

In the process of investigation on the torsional effect of quartz crystal, mirror symmetric conservative law is applied to ascertain the connection between the physical characteristics of leftwards spiral crystals and rightwards spiral crystals.

面对工程界对左旋石英晶体压电性质的描述不统一的现状，从晶体螺旋对称的本质出发，应用宇称不变性明确地建立了左、右旋晶体这两种客观实在物质的物理性质之间的联系，给出了建立这种联系的方法，并应用到了左旋石英晶体的三阶压电张量和四阶弹性张量的确定中。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。