提前ahead of schedule (or time); in advance;move up (a date)
～償付prepayment/～出發(fā)set off ahead of time/～交費pay in advance/～兩年完成任務(wù)meet the target two years ahead of time/～釋放release(or discharge) sb before the sentence expires/～通知notify in advance/～召開大會convene the congress before the due date |