“惯于”的英语可以翻译为：wont，[法] addicted ...

他们惯于干这种工作.They are accustomed to this sort of work.心理问题咨询人员惯于同有自杀倾向的人打交道.Counsellors are used to dealing with suicidal people.他惯于早起.He is an early riser....