Son, write three lines with tones. What do you mean?

Write three lines in tones one, two, three and four. Tone refers to the change of language tone. In modern Chinese phonetics, tone refers to the inherent sound level of Chinese syllables that can distinguish meanings. Write three lines in tones one, two, three and four. The scale in music is also determined by the pitch, which can be simulated by the scale, and learning the tone can also depend on your own musical sense. But note that the pitch is relative, not absolute.