Mosquitoes are most active in the evening or early morning in summer and autumn. If you stand in a place where mosquitoes gather and sing a little song, you will find that when you sing the long syllable "1" (many), many mosquitoes will be attracted by you and even fly into your mouth. But when you sing the long syllable of "4" (法), they will quietly go away. Despite many experiments, its secrets have not yet been fully revealed.

Because mosquitoes like to hear the syllable "1" and hate the syllable "4", scientists have taken advantage of this interesting characteristic of mosquitoes to create many types of loudspeaker contact killers to lure mosquitoes to gather and kill them. Of.