This deadline will be extended only in exceptional circumstances.

只有在特殊情况下才会延长最后期限。

《牛津词典》

I have never seen the video cable go bad, but I think that in exceptional circumstances, it is possible.

我从来没有见过视频电缆坏掉，但我认为在特殊情况下，这是可能的。

youdao

The time limit may be extended in exceptional circumstances.

在特殊的情况下时间限制可以延长。

youdao

He also said that forced transfers of staff, which critics say demoralized workers, would be applied only in exceptional circumstances.

VOA: standard.2010.04.11

This permits abortion in exceptional circumstances, such as where a woman's life is in danger.

BBC: Sinn Fein oppose proposed amendment to NI's abortion law

The shares to be issued to Intel, TSMC and Samsung will be non-voting except in exceptional circumstances.

ENGADGET: Acronym-loving Samsung joins Intel and TSMC, buys stake in ASML

If passed, the amendment would restrict abortion to be carried out only in NHS premises in exceptional circumstances.

BBC: Tyrone GAA manager Mickey Harte in abortion appeal to MLAs