The meaning of spectrum is:

Tables, books or pictures compiled according to the category or system of things.

Musical works recorded with symbols; A watch used to record music.

Compose music; Music the lyrics.

A rough standard or plan.

Show style, ostentation, etc.

Spectral group words:

Two words: composition, music score, piano score, staff, Facebook, genealogy, performance, outrageous, menu, music score, menu, etc.

Four words: genealogy file, feature spectrum, Zhenyuan old spectrum, strip spectrum, genealogy, spectrum, spectrum and so on.

Form words and sentences:

1. When I first learned to play the piano, I remember once when I came home, my mother asked me to take out my book and practice fingering on the music in the book.

What you said is so outrageous that no one believes it.

3. History is music score, and time is a beating note.