live off
1．survive on 靠…活下去
He lived off fruit and nuts in the forest．他在森林里靠水果和坚果维持生命。
These animals with long necks live off leaves of tall trees．这些长颈动物吃高树的树叶。
2．live at the cost of；depend on for support and shelter 靠…供应
He's been living off his brother for nearly a year．近一年来他一直靠他兄弟接济。
3．find enough food or income寻求足够的食物或收入
She will not be able to live off her writing．靠写作她是难以谋生的。