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在教材中的第一个意思为“听起来”，作动词用；第二个意思为“声音”，作名词用。在上面的四个句子中，前两个sound作动词用，意思分别为“（使）发出声音，响”和“鸣警报”；第三个sound作形容词用，意思为“明智的”；第四个sound作副词用，意思为“酣，沉”。