N-COUNT
造成问题的人（或事物）
You can refer to someone or something which you think is causing a problem as an offender .
例句
The contraceptive pill is the worst offender, but it is not the only drug to deplete the body's vitamin levels.
避孕药的危害最大，但是它并不是唯一一种消耗体内维生素的药物。