a one-off payment的用法和样例：
- This year, LCCA has not received any more direct funding from Leeds City Council apart from a one off emergency payment at the beginning of the year.
- "When one thing is becoming more and more intensified settlement more and more irreversible, we have to make a one off.
- "It was a disappointing performance and result," he said. "The lads can't wait to get out there, prove it's a one off and try to pick up points again.
- I need a cunning plan to pull this one off.
- She bought a one - room apartment on a 20 - year payment plan.