1. He swung the racket and hit the ball towards the net.（他挥动球拍，把球击向网。）
2. The construction noise outside created a racket that made it hard to concentrate.（外面的施工噪音神经过敏, 很难集中精力。）
3. The police caught a group of people involved in a smuggling racket.（警察逮捕了一群从事走私的人。）
4. They were accused of running a gambling racket in the city.（他们被指控在城市里经营赌博活动。）