How does the guzheng play a curved key on 2 12?

Hello, is it an arrow that bends upward?

That's the upper glide of the guzheng.

That is, on the left half of the string corresponding to the sound (instead of on the left side of the piano code).

Press it with your left hand, and the sound becomes the sound behind the sound you are playing.

In songs, this rhythm is like a decorative sound (I don't know the basic music theory of Baidu)

It's the half beat of this note that should be slippery = = I don't know how to say it

/show/unv6bnwQHPKEJ6-KFDPC3g ... Hypertext Markup Language

This is a teaching video of Yuan Sha, with a sliding sound corresponding to a foreign language. I hope I can help you.