What do the three symbols in ⊙仄仄平◎▲ mean?

"◎"符号，写在词谱上的多是经典词作)和格律诗、对联平仄 norms. It is a three- or four-syllable tone, with ○ meaning flat; ◎ meaning flat can be made into oblique; ● meaning oblique; and ⊙ meaning oblique can be made into flat.

Traditionally, so the poets in the writing of poems, into the sound is short tone. The first is to make sure that you have a good understanding of the situation, and that you have a good idea of what you are doing. The word "③" is not a word that can be used to describe the quality of a song.