It's a necessary condition for many worthwhile things: child care, friendships, etc.

对于许多有价值的事情而言，如儿童看护和友谊等，它是必要的条件。

youdao

That is a necessary condition.

这是必要条件。

youdao

It's a necessary condition for the mature love.

但它是成熟的爱的必要条件。

youdao

This was a first order condition or a first order necessary condition.

这个只是一阶条件,是必要条件

耶鲁公开课 - 博弈论课程节选

In short, Mr. Polian was saying that running a sub-4.76 was a necessary condition.

FORBES: Terrell Sinkfield's 4.19 40-Yard Dash and The Role of Analytics in Assessing Physical, Cognitive, Mental Abilities of Aspiring Athletes

New technologies were a necessary condition for the green revolution, but not a sufficient one.

ECONOMIST: Economics focus

Put it another way: domestic reform is a necessary condition for successful adjustment, but it's not sufficient.

BBC: Plan B for the eurozone?