Did you enjoy the humorous footnote where I illustrate mirror symmetry by likening it to the Flash playing tennis with himself? So funny.

象称性作了一个脚注说明，把它比喻成闪电和自己打网球，你体到其中的幽默了吗？太好笑了。

A few years later, this symmetry, mirror symmetry between the sign with the opposite sign was later confirmed by mathematicians.

几年后，这种称性，即带有相反符号的称性，后来被数学家证实了。

So an example of it is mirror symmetry.

因此，一个典型的例子就是称性。