俚语：Bite off more than one can chew/承担超乎个人能力的事

　　定义：undertake something which is beyond one's capacity or power从事某人能力所不及的事

　　例句：Men she said she would do the job I think she bit off more than she could chew.当她说她将要做这份工作时，我想她是在做超越她的能力的事。