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。

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It's a necessary condition for the mature love.

但它是成熟的爱的必要条件。

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On the Web, usability is a necessary condition for survival.

在网络上，可用性是生存的必备条件。

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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?

These objectives form a necessary condition for the achievement of the internationally agreed development objectives, including all Millennium Development Goals (MDGs).

UNESCO: CYPRUS NATIONAL COMMISSION FOR UNESCO - UNESCO Chair at the University of Cyprus - ��Gender Equality and Women��s Empowerment��