Are the old characters in Beijing Opera read between the lines or in groups?

In Beijing opera, old words are sharp to read.

So how to distinguish the sharp ball? Here's the thing. Now the sharp characters preserved in Beijing opera are some initials J, P, X in Beijing pronunciation, which have been changed to Z, C, S ... It sounds like tongue-biting, which is what people often say, that is, the sharp characters commonly used in traditional operas. Then, except for the words pronounced in this way, all the words retained in Beijing pronunciation can be called group words.