Stopandlisten!Whatdoyouhear?Youmayhearmanydifferentsoun...
問題詳情：Stopandlisten!Whatdoyouhear?Youmayhearmanydifferentsounds.Someofthosesoundsmaybenoise.Noiseisaloudorunwantedsound.Manykindsofmachines,suchasmotorcycles,jetplanes(噴氣式飛機),farmtractorscancau...