1 [U] (informal 非正式) something that you do to punish sb who has hurt you, made you suffer, etc 报复 [SYN]revenge 同义词为revenge

2 [C,U] the profit or an advantage that you receive later from money you have put into sth or sth you have done; the time it takes to receive this 投资的回报；投资回收期: Now is a good time to invest because the long-term paybacks can be large. 因为现在长期投资回报可能比较可观，所以是投资的好时间。 a 10-year payback period * 10 年的投资回收期