The term "one-off" is a common term in the UK, Australia and New Zealand. It's also commonly used in the US or Canada, though to a lesser extent.
There are mainly 3 types of "one-off"s in English.
- 一次性 (Formal, sometimes governmental) activities done, made, or happening only once. When it ends it will not be done / be created / happen again.
one-off donation 一次性捐款 /
one-off grant 一次性拨款 /
one-off deduction 一次性扣除
Chile made a one-off cash bonus payment to the poorest 40 per cent.
智利向最贫穷的那40%的人口支付了一笔一次性现金补助。
Government introduces one-off resident visa for 160,000 migrants
政府向16万移民发放一次性居民签证
In some Chinese-speaking communities where 性 is used exclusively for sex-related terms in local Chinese varieties, it's translated differently. In Hong Kong: 一次過.
- No corresponding term in Chinese. Events / things done, made, or happening only once. Not counted as part of a regular sequence.
The concept of emergency as a one-off, unpredicted crisis also needs to be reconsidered.
还需要重新考虑紧急情况这个概念是否能被定义为一种偶发而出乎意料的危机。
(Technically speaking, "偶发" is not the equivalence of "one-off". )
The meeting is a one-off. 这个会议是临时的。
(Technically speaking, one-off meeting ≠ ad hoc meeting 临时(特设)的会议. )
- 只/仅此一* (* = a measure word,e.g. 只此一次、只此一家、只此一件) Something that is unique and oftentimes valuable. If you miss it you'll never see / use / experience it again. You will regret it.
one-off design
只此一款的设计
New Ferrari SP51 unveiled as a one-off commission
法拉利新车SP51正式亮相,全球仅此一辆 / 仅此一台
Blur Reuniting For A ONE-OFF Show At Wembley Stadium
仅此一场!Blur乐队重聚温布利球场演唱会
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There are mainly 3 types of "一次性"s in Chinese.
- Disposable
一次性手套 disposable gloves
- One-off
一次性捐款 one-off donation
- In one go
一次性通过所有考试 pass all exams in one go