Open with keyboard typing to set up a quiet classroom, place this clip as the interruption, then follow it with the shocked sound for the class reaction and a burst of laughter after the teacher turns around.
关于此声音
This short clip is a bright, trilling polyphonic-style phone ring that repeats its rising pattern for just over three seconds. It feels sudden and mischievous, like a phone going off somewhere it really should not, and it makes listeners glance around before they smile.