The latter is extremely rare historically, though not impossible.

第二种做法在历史上是极为罕见的，但也不是不可能。

youdao

youdao

And it is not impossible that she and Balls have had talks about a "dream ticket", though it's not clear which one would be the leader and which one the deputy.

尽管爱德博和她谁正谁副还说不定，那也不是不可能他们曾针对这件事进行过洽谈。

youdao

For example it's difficult (though not impossible) to argue that the policy is both impotent and inflationary.

BBC: Quantitatively more easing from the Bank

This is arguably hardest in services, though not impossible: even journalists find that work expands to fill available hours.

ECONOMIST: Economics focus

His social liberalism would test PAN voters' loyalty, causing party leaders to say such a deal is unlikely, though not impossible.

ECONOMIST: Mexico's ruling party