pay off function

例句：

1. 1. I've been saving for a house payment for over a year now.
   我已经为买房子存了一年多的钱。
2. 2. The company will pay you back the money you invested in their stock.
   公司将退还你在他们股票上投资的金额。
3. 3. She paid off her student loans after working for several years.
   她在工作几年后还清了她的学生贷款。