1.paid off 付清

例句:After all these years,we've at last paid off all our debts.
经过这么多年，我们总算把债还清了。

2.finance minister 财政部长

例句:Such uncertainties should worry a prudent African finance minister.
这种不确定性会让谨慎的非洲财长感到忧虑。

3.sign up 签订；申请

例句:Can I sign up for this course in advance?
我能事先申请上这一课程吗？

4.be aware of 意识到

例句:He was aware of the possibility of a recurrence of his illness.
他知道他的病有可能复发。