1.got the surprise of their lives during their commencement ceremony.
commencement 畢業(yè)典禮
He was invited to speak at the commencement.
他受邀在畢業(yè)典禮上講話(huà) 。
2.Mr Smith ended his speech by informing the 400 students that he would pay off their student loans and debt.
pay off付清
It would take him the rest of his life to pay off that loan.
他得用余生來(lái)還清那筆貸款 。