He refused to believe his son was involved in drugs.

　　他不愿相信他的兒子沾染毒品。

　　How many vehicles were involved in the crash?

　　這次撞車事故涉及多少輛汽車？

　　Three teams are involved in the chase for the championship.

　　有三支隊伍參加冠軍的.角逐。

　　She's involved in many extra-curricular activities.

　　她參加了許多課外活動。

　　After retiring, she became involved in voluntary service in the local community.

　　她在退休后投身于當?shù)厣鐓^(qū)的志愿服務工作。