So we cannot expect to find necessary and sufficient conditions for an interesting topic.

所以，我们不能期望为有趣的论题找到必需和充分的条件。

youdao

Finally, optimality necessary and sufficient conditions for nonlinear convex semidefinite programming are proved.

并给出了非线性半定规划的最优性必要和充分条件。

youdao

Attempted analyses of concepts in terms of necessary and sufficient conditions, even where they fail, abet discovery.

试图从必要条件和充分条件的角度来分析概念，即便失败了，也能有所发现。

youdao

Why? Because good will and idealism, while necessary,they are not sufficient.

为什么呢？因为美好的意愿和理想主义，虽然必要，但却是不够的。

哈佛公开课 - 幸福课课程节选

"In many ways, the secretary is arguing that the conservatorship, the portfolio limits, are both necessary and sufficient in his judgment, " said Dodd.

FORBES: Dodd On The Bailout

Good analysts are likely quite skilled at mathematical modeling, but it is a necessary and not sufficient condition for being a good analyst.

FORBES: What Makes Analytics Wizards So Good? They Do Everything Backwards

"It needs to be as long as is proportionate and necessary, subjected to sufficient judicial checks and balances, " Mr Jones told the BBC.

BBC: RELATED BBC SITES