The answer is that the lingering sound lingers around the beam, and the beam has musical symbols.

It is recommended that when the friend who asks the question encounters the correct answer, he can promptly adopt the answer that is the fastest and correct, so as to avoid other friends thinking that there is no correct answer before and rack their brains.

Accepting other people's answers is not only an affirmation of the results of others' labor, but also an encouragement to the answerer. Both the questioner and the answerer can gain wealth value. As the saying goes, you can get more with one stone, so why not? Not for?

If you feel that my answer has not completely solved your problem or you have other questions, you can ask me for follow-up questions or ask my team for help.