one-off
noun [ S ] UK uk/ˌwʌnˈɒf/ us/ˌwʌnˈɑːf/
一次性的事物
something that happens or is made or done only once
Will you be doing more talks in the future or was that just a one-off? 你将来还要作多次的讲话还是只此一次？
one-off
adjective UK uk/ˌwʌnˈɒf/ us/ˌwʌnˈɑːf/ (US one-shot)
一次性的
happening only once
They gave him a one-off payment to compensate for the extra hours that he had to work. 他们一次性支付给他一笔钱作为他必须加班的补偿。