So it's a sufficient condition for an argument being valid that there is no possible situation where the premises are true and the conclusion false. And that's a necessary condition too.

所以这对于论点有效性是充分条件，没有可能前提为真，结论为假，这是必要条件。

youdao

A necessary and sufficient condition for an inner set space with three critical sets which can be weighted is also given.

给出了具有三个临界集的内集空间可以赋权的一个充分和必要条件。

youdao

A necessary and sufficient condition for an ideal of an integral table algebra being self-orthogonal is obtained.

本文给出了整表代数的单边理想是自正交理想的必要充分条件。

youdao

Building capacities in Member States for Open Access is a necessary but not sufficient condition for promotion of OA. Creating an enabling policy environment in Member States for OA is therefore a priority.

UNESCO: OFFICE IN TASHKENT

An increasing, growing, money supply is a necessary but not sufficient condition for there to be economic growth.

FORBES: Eurozone: The Italian Problem in One Picture

"While a popular SNP isn't a sufficient condition to win an independence referendum, it's almost undoubtedly a necessary condition, " he said.

BBC: Scottish council election: Administrations take shape