It is no longer a polyphonic word. It has been pronounced as yǐ, an pictograph, and the word "has" was originally called "has". Later, in order to distinguish it, a gap was left as "has". Therefore, "has" and "has", with (? ) homologous. There is the same image in inscriptions on bronze and seal characters. They are all inverted forms of "Si". That is, the head-down fetal shape indicates that the fetus is mature and is about to be born. The pregnancy deadline is its paradigm.

Polysyllabic characters mean that a word has two or more pronunciations. Different pronunciations have different meanings, different usages and different parts of speech. Pronunciation has the function of distinguishing part of speech and meaning; According to different usage, pronunciation is different, and pronunciation has the function of different usage.