live by sth

• 靠 ... 过活； 以 ... 为行为准则

live by sth的用法和样例：

例句

1. I can't get by on such a small income.
   靠这么微薄的收入我无法过活。
2. Everyone lives by selling something.
   每一个人都靠卖些什么东西来过活。