Definition: something that you hear or that can be heard Level: A2
他们听到房子里传来音乐声。
They heard the ___sound of music coming from the house.
宝宝睡着了，所以请不要发出声音。
The baby is asleep, so please don't make a ___sound.
声音在水中的传播速度比在空气中快。
___Sound travels faster in water than in air.
