sound

　　When they were talking in the room, the bell sounded.

　　When I saw the smoke, I tried to sound the alarm.

　　My father is a person of sound judgment.

　　The baby is sound asleep now.

　　sound在教材中的第一個意思為聽起來,作動詞用;第二個意思為聲音,作名詞用。在上面的四個句子中,前兩個sound作動詞用,意思分別為(使)發出聲音,響和鳴警報第三個sound作形容詞用,意思為明智的第四個sound作副詞用,意思為酣,沉。