1. It took Charlie ten years to pay off his debt.
   查理花了十年才将债务还清。
2. I'm afraid you're expected to pay off your debts.
   恐怕你该偿还你的债务。
3. He pays off his creditor in twelve instalment.
   他分12次付还了债主的钱。
4. He took it upon himself to pay off the debt.
   他自愿负责还清债务。
5. Next he undertook to pay off the debts.
   然后他同意负责偿还债务。

　6个动词解释