It could be an oral sound like whistle, or an annoying sound made by people like scratching a chalkboard with nails.

这个触发点可能是某种口头发出的声音，比如，口哨声；也可能是人们制造出来的某种恼人的声音，比如用指甲划过黑板的声音。

youdao

It could be an oral sound like whistle, or an annoying sound made by people like scratching a chalkboard with nails.

这个触发点可能是某种口头发出的声音，比如，口哨声；也可能是人们制造出来的某种恼人的声音，比如用指甲划过黑板的声音。

youdao