VOA慢速英语:Waahh or Wee-oww? That Is the Question

siren– n. a piece of equipment that produces a loud, high-pitched warning sound

ambulance– n. a vehicle used for taking hurt or sick people to the hospital especially in emergencies

nuisance – n. a person, thing, or situation that is annoying or that causes trouble or problems

decibel–n. a unit for measuring how loud a sound is

frequency–n. the number of times that something (such as a sound wave or radio wave) is repeated in a period of time (such as a second)

piercing – adj. very loud and high-pitched