accidental

US /ˌæk.səˈden.t̬əl/
UK /ˌæk.səˈden.t̬əl/
"accidental" picture
1.

偶然的, 意外的

happening by chance or unexpectedly

:
Their meeting was purely accidental.
他们的相遇纯属偶然
He made an accidental discovery.
他做了一个偶然的发现。
1.

临时记号

a musical note that is not part of the key signature but is introduced by a sharp, flat, or natural sign

:
The composer used an accidental to temporarily alter the pitch of the note.
作曲家使用了一个临时记号来暂时改变音符的音高。
You need to play that F sharp, it's an accidental.
你需要弹那个升F,那是一个临时记号