happening only once 一次性的◆The package includes a one-time $300 tax cut. 这套方案包括 300 元的一次性减税。◆a one-time charge/cost/gain/loss 一次性收费/成本/收益/损失SYNone-off ➡exceptional
former 原先的;从前的;一度的◆Companies such as BP have been buying up one-time competitors. 诸如英国石油公司这样的公司一直在收购原先的竞争对手。